I work full-time, and I have several volunteer projects. Sometimes, it's hard to find time to write. Here are some ways that I've been able to squeeze in some time.
1. Make an Appointment - When you have time off, reserve some of it for writing. If you're serious about writing/editing, you need to make the time. I've had to jettison a few things too.
2. I use my lunch hour for writing time. That gives me an extra five hours a week.
3. Join a Critique Group - Your group will keep you motivated. You need to have new samples to submit, so it gives you a schedule and a deadline.
4. Keep Score - Keep a count of your writing progress. You will quickly be able to see the peaks and valleys. It is also another good motivator. I keep a work count in a spreadsheet. I started last June when I did an online challenge with my group. At the end of the month, I was amazed at the progress I had made. A little competition helps too.
5. Get up Early - Get up an hour or two earlier and devote the time to writing. If you wake up in the middle of the night and can't sleep, write.
Best wishes with your work in progress!