1. The idle could be the closed throttle switch. THIS REPAIR SHOULD BE DONE BY A QUALIFIED TECH/REPAIR FACILITY ONLY. Or it could be an idle speed actuator.
2. Go get some dash hooks
3. The screws are located just below where the spring is for the decklid. They are 7 or 8mm in size and you should be able to see them from inside the trunk.(If you can't find them e-mail me and I'll take a pic and e-mail it back to you.