Hi K....
I remember bike riding with my girls when they were little.. I made sure there were helmets, elbow and knee pads on before the lesson began, because there were falls, it's an unavoidable part of learning.. They also had special sport gloves that protect palms from road rash... I got them from the skateboard section of the sport store.
Anyway.. The training wheels come off when they felt ready and brave enough to want to do it.. I taught my girls when they were in 6th grade how to ride w/o their training wheels by steadying the bike as they began to ride.. Holding the seat behind them and the handle bar fork in front, and running along side them as they peddled. Once they got some speed I simply let go!
The most important instructions were to keep the handle bars straight, and to NOT look at the front wheel.. look at the road way ahead of you..
They are 17 and 13 now and still wearing helmets... There were many scraped elbows and knees in the years inbetween learning and now.. but it's all part of the process..
Have fun! You have made me nostalgic...
Val