It's like pulling teeth with a tiny pair of tweezers while juggling watermelons! So many things to line up, complete, polish, fret over. A bit overwhelming if you stop to think about it.
All you can do is pick 'this thing' to do right now and go do it.
When 'that thing' is done, pick the next thing and go do that.
If you don't take a single step you won't go anywhere.
My editor is almost done. Check!
Next is rewriting the final scene, then reedit that.
Next is ??? we'll see...
Keep stepping forward, ladies and gents, don't stop to worry about getting to the end.
Just keep walking until you get there.
Be cool, be good, enjoy the moment.