I can only give general technical advise for selfstudy (but very important):
Listen very carefully to yourself, find out your technical flaw and then find a technical etude (Hanon or w/e) wich handles that flaw.
And realise there are 2 physical stages of technical studying. The first one is getting the brains used to certain finger movement. The second one is generating muscle 'stamina', by playing alot. This all takes time, and give it time.
Gyzzzmo