I admit I probably lean on my betas much more than I should to do the heavy lifting for me, but I have made a habit of reading fic aloud to myself to see if it "sounds" right.

A good habit has been to remind myself that it's okay to toss out things that don't seem to be working well or maybe an idea or scene that is better used in a future fic (don't toss it, save it!). I will often write out an entire first draft and make myself not self-edit until later. But as many people have said, sometimes the best editing process is what works for you!