Wow, you sound like me - procrastination leading to giving up because I think there's no way I'll make it! Anyway, I do the same thing, count the pages (or amount of lectures) and feel like it's impossible, but one of my tutors whom I spoke to once gave me a really helpful insight; think of what you've done/can do. E.g. Set yourself a goal to do say 30 pages in the day, then by the end of the day you'll have done 10% of the book. Then if you do that for the next day it's 20%. Don't look at what's left, look at what's happening and what you can do, set short term goals.