You can't win them all but you can try.
I couldn't hit an elephant's ass with a bull fiddle.
The more you practice, the better. But in any case, practice more than you play.
A couple of hours of practice is worth ten sloppy rounds.
Practice, which some regard as a chore, should be approached as just about the most pleasant recreation ever devised.
I just hitch up my girdle and let 'er fly.