The best tip I can give is to do some advanced research, ask the questions so you'll know what you're working with. Then map out a plan that makes sense to you. Get your tools together: 1.) File Manager program, 2.) P3DO Explorer, 3.) CorrectReference or CorrectReference Pro, etc. Then make a backup of your current installation before you start. You might even consider backing up everything, then deleting it so you can start over from scratch.