The solution I hit upon which moved me forward was this: research problems are homework problems. You could give me a homework problem I had never solved before, and I would work diligently on it. I was not deterred by the fact that I had never answered this homework problem before because I knew SOMEBODY had answered this homework problem before.
A Research Problem was just a Homework Problem asked for the first time. BEFORE the first person to do it had ever done it. With this attitude, I was able to work on a problem with the artificial belief that OF COURSE it could be done, and so I should stick to it until I had done it. The belief was artificial because, in the case of a research problem, it had NOT been done before.
Once I got used to working on research problems it was totally better than homework. No longer was I interested in homework, but only in these incredible investigations that hadn't been done before.
I should add that I wouldn't have even vaguely understood the questions if I wasn't on a daily basis exposed to great research.