Simply do things before you can think about it. It takes a lot of time to train your brain for it but I swear it works. I think about my goals the day before and keep them in mind. When I feel that little thought of "I should" I do. It's not 100% effective all the time but honestly just make everything as simple to complete as you can and keep tasks you want to do your back of your mind and then pull that trigger whenever possible without question.

Todo lists too

But yeah if I let myself have that time to think about my task I can usually always convince myself to do it later and that's my problem I think