Bollinger bands and charting are in the same bracket as astrology.
To the degree that someone like Roffey goes into I'd say probably, but many stocks are closely correlated with basic technicals. It's really a psychology thing - it's the proverbial self-fulfilling prophecy in that half the market believe in trading on technicals so they move the market accordingly. They're also pretty good tools in confirming trends. Using a single indicator as per my example is never a good idea (I could have been more clear on that). But if you're approaching a reverse head and shoulders pattern, are at the top end of the bollinger bands, notice a steady reversal through previous resistance levels, and identify trends in how the stocks previously performed in similar circumstances, then you can with some level of confidence have an expectation of where the stock is going to move. If you ignore all of these metrics then you're simply taking a shot in the dark and gambling imo.
This is why it is important to look at various charts to analyse a stock. If the 3 month, 6 months, and 1 year charts all trade in a pattern that you can easily identify, then you're probably on to something. For amateurs it is best to not dive in head-first, but to rather watch the stock for an entire month and place a few imaginary trades on paper. Paper-trades are a fantastic tool to confirm your strategy - people are forever looking for mock trading platforms when in fact all you need is a piece of paper, a pen, and a calculator.
What I'm trying to show is that you can invest or even trade with a fair degree of success by whatever method suits you, but understanding some basic technicals can help you to invest a little smarter. Such as looking at candle-stick charts. You can plot a linear progression of the bottom end of the candle-stick (shows the bottom end of the price) and depending on your charting software, can extrapolate that into a forecast. You can do the same for the top-end and easily identify a wedge pattern, for example. Once it begins to break through the resistance levels and a wedge pattern exists, it is safe to assume that there is downward pressure on the stock and you might want to look at getting out, or watching for it to bottom-out and get it. Also plot previous longer-term support and resistance levels which are certainly not hocus pocus. Understanding these helps you to determine where the stock is trading in relation to these - there might be massive support for the stock at the moment but historically it reaches a resistance level and reverses. If it breaks through the the trend is confirmed, that resistance level will more than likely become a new support level as well. Also don't forget to overlay the overall index and the index for the stock as well - see if it is moving with the market or whether it is moving the market. Plot a competitor as well. Plot the futures prices, particularly the JSE futures market if you have access to this data.
Although many of these are trading tools, they can to some extent to be extrapolated on to the investment environment as well. You can identify whether a stock is trading on the cheap and has done so historically. You can identify when such a stock breaks through previous resistance or support levels. You can with some confidence have an expectation of where the stock is likely to move in the short-term. You can monitor trading volumes and correlate these with volatility indicators to determine whether a stock matches your investment criteria (i.e. is there sufficient liquidity; is too volatile or is that what you're looking for? Is there a tapering off of volumes or an increase in volumes? etc) Does it trade cyclically? Are results being announced soon and if so, how is the stock performing beforehand? Do you want to be exposed to additional risk at this time? Look at how it is trading to determine that. Is there M&A activity in the industry as a whole or even in the company? What cautionary statements are out and why? Do they have a share buy-back scheme in place? Why? What is the intention? Are they clawing back control? Are they buying another company without diluting shareholder value? Are there board changes? What are the consensus estimates? Who are the expert analysts in the sector and what are they saying about the company?
I really could go on all day, but the bottom line is that becoming an expert in a few stocks is in my opinion a better strategy than trying to follow the wider market and chasing gains across the board. Importantly, you will understand why the stock is moving as it is. When you see a reversal pattern emerging, you can then dig deeper to understand why. Is this based on technical trading alone, or is there something else going on that you've missed? Similarly if it breaks through previous resistance levels. Why? Being a dart-throwing investor means you will not be able to answer these questions. Becoming an expert in a few means that you can. It also means that you might be happy to take a leveraged position using a derivative instrument later down the line, affording you the opportunity to go long and short on the stock and minimise capital outlay. The risks are higher but you'll have a deep understanding after months or even years of investing/trading the stock to the point where you actually feel comfortable in your positions. This means that you open the wider scope of your portfolio, allowing you to divest in other asset classes.
Bottom line is that chasing gains around the board will leave you a very unhappy investor imo. Everyone has an opinion. Not everyone as insight...