some things I can recrommend are the silver screws in the battery case, leave those in unless going under the lcd tray, I made a mistake and put the wrong screws there, and it made dark spots on the lcd screen. and make sure the analog stick doesn't come apart, I'm still not sure how the spring in there went on. other than that it's easy, I've never replaced it, but I've taken it on and off many times.
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