I recently picked up a Rubies Collectors Boba Fett helmet with the intention of repainting it as a Return of the Jedi version. The Collectors helmet is not very accurate, being thin plastic vacformed pieces glued to a polystyrene core, but it'll do as a placeholder until I can get something better.
I found some templates online, and decided to simplify it as I wasn't going for screen accurate with a cheap helmet. I already had a few spray paints I could use, so just needed to get some Humbrol Dark Green 30 for the main colour, and a Burgundy for the visor.
First step was to dismantle the helmet by peeling the plastic pieces of the styrene. Only a few blobs of hot glue had been used so it came apart pretty easily, and the surface of each plastic part was rubbed with wire wool to prepare for primer, and the clear part of the visor covered with masking tape.
All of the parts were given a few coats of Halfords grey primer for plastic, and then a couple of coats of silver.