I've just read one of the posts about the average time for to complete the first solo and I'm completely surprised at the low hours that some people have done it in. If the first handful of lessons are on the basics (effects of controls, straight & level flight, climbing, descending, turns) before moving onto landings, etc and each takes at least an hour then how can the solo be done in single figure hours?
Some people have previous experience say on gliders which puts them a bit ahead of the curve. Don't worry about it.
Don't sweat the taxiing, as long as you're not swerving from one side of the taxiway to the other then just keep it reasonably staight reasonably on the centreline.