It's the scourge of being a weekend warrior. I've often wondered about the life of a daily player, those special few who can make it their task every day to practise and learn. I get a few minutes a day or less to play, as it's not my full-time job. Go easy on yourself. When you think about the number of songs we know with all those notes and little complexities, it's incredible, really. The odd mistake drives me on to try not to do it again. I generally substitute one mistake for another, iron it out then move onto the next.