I have only made the mistake of reading a book on diet one time in my life. That book, however, stated that you should eat the food you like most first because if you can get filled up on the stuff you like, you won’t stuff yourself later when you’ve only got the good stuff left on your plate. I had been a long-suffering eater of bad food first because I wanted to get it out of the way. This simple idea opened my eyes.
Then I applied it to work. I start my day of work doing tasks I want to do. Then I do the important tasks. Then I do anything else I have the energy to finish.
Boring stuff gets pushed or delegated. Don’t drain all of your energy on the stuff you hate. Do the stuff you love and you’ll have the energy for more productive days.