I am aiming for 90%. The main question is what's your accuracy when you demonstrate it to your friends? I have showed my friends about 7 times that I can solve it blindfolded, and have messed it up once.
Contrary to my initial guess, it didn't feel that bad (the once that I messed it up). But try demonstrating it to your friends (and request them to shut up throughout the solve). It motivates you to be more accurate.