But here is what I would say: pick the smallest of tasks that is part of the larger work and convince yourself it's okay to only get that part done today. Also convince yourself that it's okay to do a 'Mad Dash' on it - focus on making progress, not making perfect. Save the edits and polishing for when you are in the zone.
This is how I get myself to the gym a few times a week. So many times I've told myself it's okay to just go for 10 minutes (and then sit in the hot tub :-). But once I'm there I almost always do my full regimen (which is only 45 mins).
So maybe that is my strategy: only focus on 'getting started', not on getting done.