I'm usually okay once I get going, but when I have to drop it...it's usually for weeks at a time.
Then I come back to it and it's hard to find the exact spot where I left off.

One thing that has helped me a whole alot is a dry erase board on the wall. A piece of cardboard or similar would work.

I usually write down the next 2 or 3 detail steps (not big picture steps...we are trying to break it down instead of being overwhelmed)
I make it a point to go look at that every chance I get, and attempt to do a little something towards the goal.

I really need to take others' advice here about asking for help. I'm pretty sure there are plenty of folks who can do
what I need done, way better than I can, at a reasonable price. That's something that has held me back for
a long time, that I need to get over.