Giving up means giving away all the time spent with the project. Go through the guidelines again and again. Know where you are in the process so that you can focus on getting unstuck. Bring discipline and rigor to your work. Look for patterns.
All invention is an extension of someone else's previous invention.
Organize your environment. Arrange your time with others so that it does not interfere with your process. Expose yourself to diverse stimuli, and know when to stop and walk on the beach, etc. Don't get so far into the problem that you can't get out of it. Let your intuition work with you.