I find that "plan then do" is a trap. I find that what propels me on is being in the middle of something. When you finish a plan, your mind goes "Done." and moves onto the next thing.
I find 'the trick' is to start working on your project
while you're planning. That may seem inefficient, but it's actually not - it informs your plans and makes them more accurate.
And even if you have to rethink at points it's certainly more efficient than not starting!
I think you'll find it a lot more motivating once you're actually in the middle of
doing your project.
P.S. I find that I use the expression "I find" a lot.
