I would go out to work on my hardtop back in the day and turn around and go back in the house. I was so overwhelmed. Then I told myself to do 1 thing a day no matter how small. Most times once out there I would get a shitload done.
That's the process I use now. Sometimes it really is just a small item, but sometimes it's hours. The benefit is building that routine of going out and doing "something" for the project no matter how small. Eventually, the 1000 mile walk gets shorter and shorter, one step at a time.