Sorry to disagree with the consensus here, but spraying gives a much better finish than brush/roller imho.
All you need is a £100 compressor, a cheap(ish) gun - mine cost about £150, a bit of 'net research for hints'n'tips and some sort of booth - a domestic garage or even a large tent/enclosed gazebo will do and Bob's your Mother's Brother.
On a fibreglass car start with a couple of coats of etch primer then a couple of coats of high-build primer. Once that's all flatted back, finish
with five or six coats of cellulose as it won't crack like modern two-pack will on a flexible base (I swear by Jawel paints for amateur use), then cut back with finer and finer wet'n'dry, Farecla G3 and a final polish and you'll be amazed at the finish that you can achieve.
Both these were sprayed at home by me with budget equipment and no formal training -
Well worth the effort.