The hardest part of writing for me is keeping my bum on the chair. As soon as I sit down I start remembering all the important things I should be doing, like cooking a particularly tasty and overachieving family meal, making a grocery list, writing to someone, phoning a friend....
And if I manage to push them aside and really get into my work, as soon as I get stuck the distractions pop up all over again, luring me to do more pressing things that do have deadlines, or to take a quick run around the charity shops.
The answer for me is to play music while I write. I have a huge selection on my PC, and put it on random selection so I never know what song will play next. It seems to keep my distractable brain occupied, while my creative brain gets stuck into my thousand words.