Get really angry at yourself for procrastinating! It worked for me, I was procrastinating and was so sick of it, I said enough is enough, yelled at myself, then I started working....
The other tip I have, is when you are working, leave it a little bit unfinished. A really easy nice fun bit to do. Then when you come back to it the next day, its easy to start up again because you have an easy thing to start with. That starts the work momentum.
HTH, potatoes