Very little effort really. The relays/transmitters etc can be bought separately, I think the prices are on their website.
We paid an electrician to install a couple of light switches, geyser relay (didn't go for their geyser wise thing), pool pump relay but Qwikswitch claim some of the switches are DIY.
With the hub for R1 500, insert and activate the SIM card, load data plug it into any plug point and log onto the Qsmobile site where you can view your installation modules and switch them on or off, set a timing schedule and so on. When I'm away for a few days I swich the geyser on 3 or 4 hours before getting home so water's hot for a bath. Quick and easy.
To be brutally honest the quality isn't the greatest (remote is a bit bulky and plasticky but it's a couple of hundred rand and it works so I'm not complaining).
If you're interested speak to Dillan in the Cape Town office, he's clued up.
Just for the record - I'm in no way affiliated to Qwikswitch and don't know anybody who is.