Aside from people you might have read about in Sunday School, I don’t know anybody who is perfect, regardless of how much they may have practiced.  Practicing may make you better, but even that’s not guaranteed, depending on how well you practice.  But no amount of practicing is ever going to make you perfect.  Of course, you can redo something until you get it perfect, maybe, but that’s not the same as practice, now, is it?  Or, as the Buddha very well may have said, "Perfection is a fool's errand."