This is a lot of reading, I know, but the process can be difficult for some and if you don't do it correctly you will have problems. I recommend you read everything carefully, because people with problems would come back and post in those threads and get answers. Odds are most anything that might go wrong for you already did for them and you will already know what to do. If you still have problems I would post your questions/problems in the upgrade/downgrade thread where skilled board members can address them.