Procrastination is when you don't want to do something important now, putting it off as much as you can and doing something more pleasant instead. Like for an office worker surfing the web instead of doing work activities. For a student - watching a film or hanging out with friends instead of doing homework. Your brain tries to avoid negative feelings about doing unwanted stuff and proposes a comfortable but, obviously, wrong solution which makes you temporarily happy.
This causes a lot of problems - not only people don't do what is important, but in addition they know that and the feeling of guilt arises. Which makes them even more unhappy.
One of the ways to overcome this is to simply start doing that unpleasant activity. It is easy and it turns out, some time after you start the work, that negative feeling disappears. Thus, if you are facing procrastination issue with a task, one of the best ways to win it would be to just start doing it. Split your work into work and break periods, concentrate on the work during a work period, have rest on breaks. After some time you'll find yourself comfortable doing it.