Yes exactly, key to Amanitas is the preparation. I've never had them though. Northern people over here use reindeer: the reindeer eat the shroom, then piss out into a cup of some kind, and their stomach metabolizes it in a way that the poison is left out of the piss and only the psychoactive ingredients stay. Yeah :D
The first psychoactive substance I had was weed and I definitely did not wait until it felt right, the opportunities just happened to come by when I was out with friends. I didn't know how to do it so it didn't even work the first few times but then when it did it was amazing...but that was due to the friendly group and atmosphere. The 2nd time it worked was a bad time, because the group and the atmosphere wasn't friendly. The first time I did a psychedelic was very different, in that my then-partner suggested we do it together, and then we prepared for the trip for about a week before taking 1 LSD tab per. That trip was also, very amazing.
The way you are approaching this topic sounds great to me, I feel like you are treating the substance with respect and you feel mature and not out to just 'party and trip balls'. I would start off with very low doses and work my way up gradually over a time period of weeks, months, if I were to start over right now. I understand if you don't have a lot of the shrooms and this is not an option. If you can, have a good friend(s) with you the first time to ease the tension, unless you feel most comfortable spending time with yourself.