I wrote my guide in MS word (lol) including forum tags and urls. Then I copy/pasted over when I posted the guide. The only issue with that is the spacing is a little screwy but it's nothing major. I think the important thing to remember is what Sam said: don't expect to write a good guide in one sitting. Also, like he said, work on finishing one section at a time.
Pro tip: browse around other forums like SW and Basil. Specifically look for guides and questions about the class you're focusing on. Try to address the questions and any issues with those other guides in your guide for +awesomeness.
Thanks for the tips guys. It was going pretty well, and I'd been pasting from Notepad into the thread starter to preview, but I posted by accident st one point. It's alright though, I'll continue with it as soon as it (hopefully) gets approved.