Of course it depends, for me timeboxing works really well. Each morning I set up my to-do list, between X and Y time of the day, for each task I want to achiev

Of course it depends, for me timeboxing works really well. Each morning I set up my to-do list, between X and Y time of the day, for each task I want to achieve. Then I follow that list. Even if I don't want to do the thing that I'm avoiding, I'll schedule 30 minutes for it and at least look at it. Of course life gets in the way. People who rearrange meetings at the last minute or worse, call me out of the blue or set up meetings with 10 minutes notice really boil my piss (if you'll excuse the expression) as it forces me to rearrange my day. But generally speaking this approach has worked for me for years.