Avoid all or nothing thinking and perfectionism, one time fail is no excuse for giving up all. Do this one badly, the next one will be better (applies indefinitely).

Make up a fantasy why doing the thing is my sacred duty because I’m the chosen one (silly but works)

Be kind to yourself. I found this the hardest one - start noticing your negative self-talk, and replace it with words of kindness and patience. This is basically a re-parenting where you re-train the voice of authority inside of yourself. It took me about 2 years from a therapist noticing it in me and suggesting I should work on it to today, where I am mostly free of it.

Start thing now. By asking ‘What can I do to start thing more easily?’ you are actually procrastinating again. Reading the manual (again and again), reading one self-help book after another, or endlessly buying more tools or craft supplies can be an avoidance strategy. And remember point one, if you didn’t manage to start now, you can start now now, or the next now that is available.