When I've done reviews & articles in the past where I have to cover factual information, my process has usually been something like...
1. "Outline" - Not the A, II, b, etc. kind. Just a list of facts I need to include & anything else important. This is just a scrawl of random words that no one else can even read/decipher. It floats around with me for a day or two getting things added as they pop into my head. I can end up with stuff scrawled on receipts while out shopping & such.
2. Go back through the outline & convert it to a rough prose format. Get all the related information put into paragraphs, start getting it into kinda the appropriate review format. This usually has too much information, a lot of repetition, etc. in my case.
3. Take a little break & then go back through the previous, crossing out redundancy, irrelevant information, getting down to a reasonable word count, adding in anything I've forgotten.
4. Hit the computer & edit the previous as I enter it. Get it entered, then read back through & keep editing as I go until I'm happy with it, which might take 1 read-through or three, just depends.
It sounds like a lot, & I'm certainly more thorough than some, but the process gets a lot faster & more automatic as you get used to it. The most important part for me is breaking it up into chunks. If I try to just sit down & do everything in one sitting the result is never as good. I *can* do it, but really prefer not to & breaking it up works better when you have other commitments anyway. And, hey, at least we aren't reviewing toasters or something.