Stick usually takes 3-4 weeks. It gets easier as soon as you get a better grip of the stick. Hitting the buttons just take practices. Just make sure you are using all your fingers and not just your index/middle/thumb.
Practice fireball and dragon punch motions. I would recommend just doing 100 fireballs/dragon punch on P1 side, then do it on P2 side every time you get bored. Remember, don't grip the stick too tight, that's usually why people have trouble getting used to it.