If you are using a blue FOMOCO pad, you might want to enlarge the map light hole in the metal dash to prevent bending the map light when you get the pad aligned with the glove box button. Otherwise, take your time and do a couple of "dry fits" before using adhesive.
If you are using one of the newer repro pads, I have had no experience with them and will have to defer to someone else who has worked with them.
Tom