Is a chore more satisfying if the work is difficult and challenging? I'm not so sure. I've found just motivating and actually doing a job can be satisfying whether it's as simple as doing the dishes or, as we have discovered this weekend, as difficult as tiling the bathroom.
So. My advice. Just get off your ass and do something. Be the end result a shining sink or a brand new look for the bathroom. Just being productive feels good.