Painting fiberglass??

[Car photographer]

Hi everyone
I've been trying to find out the best options for painting my kit (fiberglass)
But I seem to get conflicting answers - some say use etch primer, some say don't, some say 2k some cellulose - does anybody have any proper experience or knowledge of the best options to get a good finish and avoid cracking in the future.

Also not sure whether to try doing it myself or finding a local expert to take it on - any ideas or reccommend painters in the Birmingham area?
Cheers
Paul