One of the best habits I have ever cultivated is to do at least one thing each day that I would rather not do. The more difficult and unattractive, the better.
Find something for yourself, anything, that you know needs to get done, would rather not do and have been putting off. Do it. Now, repeat that behavior every day from now on.
You'll be amazed how easy this become over time. You'll marvel at your knowledge will increase and your personal borders expand. And, when you really need to do something really difficult, you will have created reserves of strength and energy to get the truly tough stuff done.