interior question

[stepside83]

im slowly but surely buliding a 1983 chevy stepside c-10 model it was just a bassic work truck a rubber floor mat no carpet, vinyl seat, cheap looking door panels and no headliner, im going to be putting in carpet, a custom made seat cover made with some sort of cloth and swede insert same on doors, im wondering tho is it possible to put a headliner in a truck like mine that never ever had one and how hard is it to, thanks for any info