Don't be afraid to give your best to what seemingly are small jobs. Every time you conquer one it makes you that much stronger. If you do the little jobs well, the big ones will tend to take care of themselves.
Don't talk age! Age has nothing to do with it. One of my guys who started out at my gym is 87 now, and he still does ten bench-press reps with a hundred-pound dumbbell in each hand. He's training to set a leg-pressing record. I put things in the guy's brain way back when, and now he'll never get away from it.