That is so great,
I taught all of my kids to sew at a young age, A lot of the machines have the speed control and such, I started by being behind them, it didn't last long, they wanted to do for themselves, I just put the foot up on something so that they could reach it, of course this is a pain when I wanted to sew as I had to move everything around to be able to do it. They are all tall enough no that they no longer need anything, they mess around all the time doing things here and there and don't require more than guidance some times (though my son doesn't do a lot)