umm, concentration and self control. Once you start enjoying learning new material, even within a new peice, than you will want to. When I get a new peice, usually the first week is hard because I don't know the whole peice, and its a lot of hard reading/technical work. However, once i have a grasp on the peice, it's all fun perfecting it. Just separate and define the hard/new parts, and only focus on those for a few days, then after that initial hard part it's not bad.