It's also good to remember that Jim is often wrong.

Last week I found myself procrastinating for hours because something was going to be hard, was vaguely defined, wasn't going to work... and in the end it turned out to be five minutes work to try the first thing that came to mind, which was enough to solve the problem.

So in order to fool Jim, don't think about doing that whole big thing you need to do. Just tell yourself you'll only work on it a little bit for, say, ten minutes. Jim can hardly object to that.

And then much of the time, you made some kind of concrete start in that time, and the objections disappear.