No disrespect, but there's a little misinformation here.
You would most likely not be able to r-use your rail cloth because it was stretched and trimmed on top and bottom, so you won't have enough to grip and stretch properly.
Also, the speed in Simonis from slow to fast goes 860, 860HR, 760, then 300 Rapide, which is a Billiard cloth, not a pool cloth. If you're on a budget and you feel that your table plays faster than normal now, 300 is out of the question.
My opinion towards the OP, if you're a true, good DIY as you say, pull it apart, see how it was put together, and DIY. Yes you can search and read and ask questions, but don't be offended if no one will give you the step-by-step. At that point, it's not DIY, it's someone else doing it with your hands.
You can't really call a car mechanic and get step-by-step detailed instructions on how to replace your starter either. You can buy a manual, you can go to one of those sites where you can pay to ask a pro, or you can DIY. We are a little more free with the info around here, but only to a point.
The project you're getting into is more involved than just your typical work on a table. Some guys on here have attempted to do it from the info on this site, and I think just about every one of them have said they would never do it again...they would hire a pro the next time. Keep that in mind.