eggsyobsessed has said that you gave her some self beta-ing tools to help with editing. I too hate the editing process so please share these tools with the rest of us.
I am always happy to talk about writing and editing!
So step one is this, and it is the most important thing: you don’t need to have it perfect, if a mistake or two are in your fic that is okay. There is no such thing as perfection, and to strive for that will make it too daunting for you. What you are striving for is the best you can do, be, and each time you edit that goal is a little higher, because you get better each time you edit. A MISTAKE OR TWO, A TYPO, MISSING COMMA, ARE ALL OKAY. IS YOUR STORY READABLE IS WHAT MATTERS MOST.
A good way to do a technical edit (so grammar) is in your word processor write it in your normal font, walk away for 24 hours and when you return switch to a different font for editing. It forces your eye to read the words, not just skim through it because it looks like how it usually does.
If a passage doesn’t feel right, but you don’t know why - read it out loud. I swear reading out loud is one of the best tools when something feels wrong. Because if your tongue stumbles, you know that is where a problem is. It works for grammar, but also is effective for dialogue if it doesn’t feel natural on your tongue, it probably wouldn’t be natural for a character to have said.
From a story point of view a good think to think about is “Why is this character sharing this information?” Is it because it is necessary to plot or character, something they would honestly do or say, or are they providing that information solely as an info dump for readers. If it is the latter is there another way to convey that exposition?
I always have a core for the stories I am writing, a feeling I want to convey, a heart of it, that I always try to sum up for myself in less than 7 words. And as I write I always keep in mind, is what is happening serving that feeling, that core? Stories can meander and change but if you keep true to a central core, you’ll find that it goes well.
Along with that, you want to keep a story under control - know where it ends. A lot can change or grow on the way there, but I find knowing where your story ends, really helps the shape of a story overall.
Hope this helps, feel free to ask any other questions, and others feel free to add to this with your tips and tricks for self-betaing!