JD,
Is it wise to advise a PPL to ask for RAS or RIS not knowing of his qualification to fly either?
MG,
For my tuppence worth It sounds much more professional and can be more effective if the GA enthusiast:
a) Listens for a sec on the freq before transmitting.
b) Speaks at a reasonable pace, not too fast or slow, including all relevant info.
c) Thinks before Tx. Reduces the err's umm's etc.
d) Is patient. A busy MATZ/visual cct/CTR or CTZ can require some negotiation to get you through safely.
e) Sends a beer or two at Christmas if you do this sort of thing regularly.
Good luck