I have a serious love and hate relationship with editing. I love to edit but I hate the fact that I have to stay still. I'm a person who loves moving, so the idea of sitting in one place (that's not resting) just makes me not want to do it. I find this is the problem most adults have with editing, and why you never complete a project.
So here's my tip: Take Small Breaks!
If I'm editing for 8 hours, I take small breaks and do something outside of looking at a screen. Taking breaks is important, it's like refreshing your mind and looking at the work with fresh eyes. I'm currently doing it right now, I'm editing a project and I took a break to write this, then it's back to work.
Make sure when you pick a break activity that it doesn't take up too much time, I mean you have a deadline to meet for christ sake!
Some of my activities consist of - A small workout, reading an article or a chapter of a book. I stay away from youtube videos because youtube is a time sucking vortex. Staring out the window (my form of meditation) Looking at Instagram or Facebook (but I give myself 10 minutes max) Walking around the block. Play with my daughter (if she's home) I'm serious this is what I do, and it works. I walk back to the edit bay with fresh eyes and I may see something that needs fixing, or the best is when everything looks great and I can move on to the next scene.
Fresh eyes can make or break your editing. So you have to find your speed. Some parts of the edit may be more difficult or easy than other parts. Pay attention to your editing habits like take note of your 're-watch' rate and how many new cuts you add to the sequence. Some scenes you may take days, and some may take hours.
So if your edit isn't coming together like you want it, it's probably because you're not taking enough breaks.