If you want to do it right, you’re going to want to take all the trim off and sand that bad boy down to bare metal. Bead blasting would be quicker but the average Joe may not have the set up while you can save some by getting it to bare metal for the shop and just let them do the body work and shoot it.
if you like the patina look which I do, I’d say just get a red 3M scrub pad, wash the truck really good, go at it with the scrub pad then wipe on some poppy’s patina clear coat. It’ll make that puppy SHINE!
I think you could do the Poppy’s wipe on clear for around 100 bucks while you think over a 10-15k sand and paint at a shop.
here are a couple shots of the poppy’s wipe on clear I did on my corolla (please excuse the Toyota on the s10 forum, but just want to show what you can achieve easily). Red in color too. Should be pretty easy to see which are the before and which are the after shots. The before have lots of oxidation which came off with the red 3M pad. LOOK AT THE SHINE! Your truck would pop with this stuff. I’m not sponsored, it’s just a really really good product
I’ll likely do my 1987 S15 hood and roof with poppy’s soon too to seal it up. It’s pretty rough like yours but the sides are okay