It's hard, I am a champion procrastinator!
I think chunking the work down into smaller quantities helps it be less overwhelming, and also just making a start, any start, even if not on the hardest task, even if it's not great quality work, providing it is something works for me! So if it's an essay or report, just getting some words down on the page, maybe just some bullet points or headings or a general structure outline stops that hideous 'blank page' feeling and once you are into the flow of writing you can get more into 'the zone'.
I do also like to make myself a nice plan, working back from the deadline of the submission date or the exam or whatever it is, and work out how many words/pages/tasks I need to do per day, that way I can see that unless I do 500 today I'll have to do 1000 tomorrow, and if I don't meet my targets this week I'll have an impossible amount to do the week after so I really do need to make a start (but can happily stop once I've done that much if I want). That being said, sometimes the process of making the plan, usually beautifully colour coded and organised can become a procrastination in itself
so don't go mad!
Small treats, breaks and rewards, even just going out for a walk or having a nice hot drink during the day or similar can help but don't let yourself have them until you've done a minimum amount of work. I've found I can no longer 'treat myself' to telly or MN/social media or anything like that in the middle of the day as I'll never stop and go back to work, so those are things saved for the end of the day (says she on MN, not working right now
), I am 'allowed' to sit staring blankly at my laptop screen or re-reading the instructions over and over if I really am stuck but I can't just give up and do something else - usually my brain through sheer boredom I think will come up with something to put down and then I'm away 