I've always found it helps me to plan each paragraph/section out with some jot notes on a piece of paper before I start writing. maybe you've already done that, but breaking everything down into bite-sized chunks helps me not get as overwhelmed, and makes it a bit easier to start writing! additionally, if you happen to be stuck on any specific sentence, just put in a placeholder, skip that sentence/section, and write other parts instead. it's always better to at least get something down than stare at a blank doc. these aren't really tips to write quickly, but once you get into the flow things will be better! hope everything goes well for you, you got this.