In the past I read a lot of self-help books and found no value in that. Some books contradict others.
If you want to motivate yourself to clean out a blocked drain, then just bear the smell for a few days, walk through the crap and dirt. You will be motivated or you will call a contractor.
If you want to motivate yourself to read a book, then set the stage, get the bottle of wine and a blanket, settle down and start reading. If after the first 3 or 4 chapters you do not enjoy the book, quit trying.
If a buffalo is chasing you, run mate ... as fast as you can. Motivation kicks in very fast in such situations.