Ive done several sets of them, along with some Pontiac Rally IIs which are similar. Nothing difficult, pretty straight forward.
The correct color rattle can stuff will be fine, since theyre prepped well (blast/prime). Like anything else, prep is key.
There are stencil kits out there, but Ive never used them. I just lay down the masking tape, then use a fresh razor blade to trim.
As far as a resto estimate, I would think around 2-3 hrs per wheel. Start to finish, and its 3 colors (including the backside).
dave