Your post doesn't say whether you're planning to do the refin or if someone else is. if you're going to do it....
First, search refinishing threads on TB - there are many.
Second, do research at Reranch.com - lots of good stuff there.
Third, buy Dan Erlewine's book on guitar repair (Amazon has them used) - it's one of the best references you'll ever find.
Finally, if someone else is doing it, then IMO it doesn't matter much whether or not you loosen the truss rod as long as it's not going to sit that way for six months. If it makes you feel better, loosen it one turn. You can always tighten it again when you re-assemble and do the setup.