Well, the difficult emotion is often some form of fear. Fear of failing, of making a mistake, in some cases, of making the problem worse. All of these fears are in a fundamental sense legitimate, but the direct solution is, insofar as it is possible, to prepare and practice.

The alternative is to tackle something even harder that includes the thing you want to make as a special case. This is a recent discovery of mine. The pressure of accomplishing the bigger, harder thing can often drive you to simply knock out the smaller thing to get it out of the way, and that's often good enough.

There's an apocryphal story in rabbinical lore about a farmer who's frustrated that his home is so noisy that he can't sleep. The Rabbi sympathizes and tells the farmer to invite another animal into his home night after night. The farmer gets more frantic, angry even that this "solution" isn't working. Then the rabbi tells the farmer to remove all the animals, and the farmer, now in peace and quiet, could fall soundly asleep. The solution above is the same: you don't eliminate the fear, you replace it with a greater fear such that the original fear doesn't seem to matter!