You might be screaming "lies!" because I am offering this for free...but I really do not see what is so hard about installing xf...Upgrading I will do but reverting templates(and keeping customizations) is more time consuming.(So I will not revert for you) I will offer this service to anyone so just send me a private conversation if your interested. If you have any concerns a private convo will be sufficient .
You can check out This Thread for other free services .
well let's see the possibility of completely failing at installing xF... 0%...sorry if you came from a different software where there is a possibility . But on the off chance that I failed at installing(because of something on the server guaranteed ) I would fix the problem then reinstall it...Trust me though I have enough experience to not fail that epically lol. I would like to think of myself not as a complete failure but others may be persuaded to say otherwise.