Judging by the the size of plant verses container, I'd say you have a way to go yet. I'd just let it grow as is for a while. Its doing great. You know the old saying, if it ain't broke, don't fix it. Just remember if its looking good, its alright. Dont kill it with kindness, just let it grow. Its easy to make it harder than it has to be, but relax. It will let you know if something's wrong. It will droop, chage color, get brown spots, all sorts of things to tell somethings wrong. As long as it looks as healthy as it does now, its fine.
---- The more you grow, the easier it gets. The hardest part of your first few grows is the fear of failure.

P.S. go to 'grow logs' & check out everybody's pics, read the threads till your eyes hurt. That will give you a comparison so you'll be better able to tell when your plants don't look right.~~PEACE!~~