What I do is open several tabs with replies for each page. I do that in 2 different windows and use one as a back up in case I lose a post accidentally (like I did last night). I then figure out what is different this week from last week and cut, copy, paste etc. between the tabs. It works pretty well. I have also done what you suggest and save as html in a Word document. The problem is that for some reason my computer has trouble with Word. It can take a minute or 2 just to open Word, then takes a long time to save, then slows down other progams I have open. The same is true with Excel, never have figured out what the problem is. Also these html documents are many pages long in Word. It works though, and if I do the posts early in the week I save them as html in Word.
Even though I use most of Orochi's pictures I still have to watch the show and take some of my own caps. That whole process can take an hour or more. Photobucket changed something so that now it is really a bear to get the caps uploaded. It gets hung up and will only upload 8 or 2 or 15 of the 20. I have to refresh and load the ones it didn't take. Sometimes it will take all 20 but I never know what to expect. It's really annoying. I spent over an hour yesterday uploading the caps for episode 31. Writing up the posts takes 2 or 3 hours a week. If I have time I work on it Saturday afternoon but often as not I don't start until after dinner, break for Naruto, then try to finish before the Action block starts. Last night I was way behind and didn't finish until the end of the first run. I suppose, all told, it takes about 5-6 hours a week.