That would be a bit difficult but will see what I can do. Would I be able to just sit inside my house or is it not really recommended?
You can do it alone. 1.5g to 2g should be fine. I would advise you to do it on a weekend, and also do it on a day when you won't be missed for a few hours. You are going to want to be able to switch your phone off or at least turn it on silent. Start in the morning, then by lunch time you will be fine again.
It takes about an hour to start working. From as little as 30 minutes you might notice some stuff. Perhaps your emotions will change a little, or you might notice visual effects. Usually it comes on in about an hour, sometimes 90 minutes. Depends on how much you have eaten before. I'd advise eating little to nothing before.
When it starts, it will quickly build to its maximum intensity - the peak. You should be peaking starting at about 90 minutes after eating the shrooms and it will last for 1.5 hours to 2 hours. After that, you have the come down.
The peak is when your thought patterns are most affected, and also when the visuals will be most pronounced. Try closing your eyes - you should get different visuals. You will have what are basically waking dreams.
It's normal to feel anxious about your first trip. In fact, it's normal to feel anxious about any trip. You are putting a powerful substance into your body. But, if you are feeling really hopeless, I probably wouldn't do them. They can amplify emotion, positive or negative. If you are feeling down or a little sad, but hopeful that you can make your life better, I think you'll be fine. If you are feeling nihilistic, stay away. Anxiety about your upcoming trip - completely normal.
Make sure that your environment is comfortable. You'll want a comfortable chair or a bed. Or both. You might move around during the trip.
EDIT: To make it more clear, yes your house is fine and in fact I'd recommend it, since it is where you are most comfortable. Get some pot plants to look at while you trip. Or something with an interesting pattern. Thatched roofs are cool to look at while tripping. Or even wooden fences. Or even just sit in your garden.
Are you intoxicated during the trip? Sort of. It's not like alcohol, but you will know you aren't sober. I would not want to drive, but you'd be fine to drive after a few hours. Your memory of your waking dreams will fade quickly, as with normal dreams, but you will remember most of the rest. Memory loss is not associated with shrooms - however, so much occurs so quickly, that your brain will just forget about it. It is like waking up after a long sleep.
Total time for the experience should be around 7 hours. One hour for it to "come up", 2 hour peak, a few hours come down. By 5 hours you will be able to respond to Whatsapp messages and hold conversations - you just won't want to. By 7 hours you should be 99% sober.
EDIT: The above is for a 2g dose. A 1g dose will take the same amount of time to come up but will last shorter and be less intense. Personally I'd go with 2g as a beginner. You might be frustrated if "nothing happens". But its up to you - don't do more than you feel comfortable doing. I would certainly not do more than 2g as a beginner.