For GPS approaches:
What is the RNP certification status for the aircraft? If you have no RNP value then forget it. Do you know what it means? If not, NO.
What are your procedures for RAIM monitoring, if you do not understand it, you are not qualified!
What is your MEL for a set RNP value? What are your flight deck procedures for a change in RNP during flight.
A clue very few 737-200s are equipped for this type of approach, if any.