You've already gotten great advice from a lot of folks about how to begin a research project. Once you get started however, somewhere along the line "burnout" becomes a real possibility. You look at how much is left to do and it looks impossible to complete...you hit a "brick wall"...other priorities just get in the way.
You can take this for "what it worth," and honestly I don't even abide by its principles at times when I should, but I think one of the best discussions for time management is an older book (may be out of print...I'm not sure) by Alan Lakein, "How to Get Control of Your Time and Your Life." What he suggests for big, complex projects is to apply the "Swiss Cheese" approach. This makes the project not look quite so overwhelming and intimidating.
Lay out your tasks making up the project so you can estimate about how much time each will take. For example, you may not be able to start on a big task of your project right now, but can you "punch a hole" in it on a smaller task with the 10 minutes you do have free? Just something that you know you need to do that doesn't take a huge investment of time or energy. So you find out once you're able to punch a bunch of these little holes in your big project, it starts to look like a slice of Swiss cheese. Punch enough holes, what's left finally looks manageable. For me, it does help...