If you're having trouble writing it may be because you don't like what you're writing about. I had a book chapter to write last year at this time, with a bifurcated subject. The half that I knew about and enjoyed went well and relatively quickly. The other half that didn't interest me was like pulling teeth to write. I had to simply force myself to write.

Make an outline, then fill it in with details that must go into the project. Make notes that are thorough enough so you know you'll include everything that should be there.

Find the materials you have to read for your research. Then try this technique of mine: read your list of things to cover, then read some of the research material, then set a timer and take a power nap. About 15 minutes will do it. I find that the time in which I'm relaxing into the nap is also when my brain is sorting out what I've been working on. If I'm in the middle of something like this and I suddenly feel very tired, I jump on that as an indication that my thought processes need a rest and need to sort through stuff. Most times I get up from the nap (when the timer goes off--DON'T go back to sleep or you lose the benefit of this technique!) I can sit down and do some good solid writing.

I thought this was my own personally developed technique, but recently a professor of mine commented that he relies on power naps to help him sort out some of his most difficult writing.

Great minds think alike!

Good luck. Don't put it off, get going and you'll also feel virtuous when you get finished by having been so disciplined in your approach.

SRS