how do I know that I am able to learn without a teacher?

[onwan]

Hi!
I meant,
I'm at home and practicing the piece, and I suppose, that I play it good. I can play it without mistakes...and everything around it...
And after that, I come to the lesson and the teacher finds a lot of mistakes and remarks to my playing. (that I play it much fast,I don't play it deeply enough, I play it so hard, the sound quality is bad...)
I don't know what I'm doing wrong when I practice...
So, I am very afraid about learning piece without teacher, because I will learn it wrong.  But I actualy want to learn something alone, because in lesson I haven't much time to study easier pieces, played only for fun, but I want to know them.

Is there any advice how to study alone? When I am ready to learnd something alone? When have you started self-study?

[outin]

 When I am ready to learnd something alone? When have you started self-study?

Looking at your signature I'd say you're ready... I would think self-study is just as important as lessons... Of course there's always something one can do better and a good teacher will spot those things.