How Do You Forc Yourself to Do Something That's Unpleasant?

Forcing your mind means shutting down part of it so that you don't have access to it. That actually denies integration, which is a basic philosophical need for people. You should be able to take an unpleasant step without having to shut down anything in your mind. If you feel like starting on the top priority but can't get over the hump, there's new information and you need to introspect - not shut it out.