Never done a truck but I'm sure it's very similar to doing it in a house. I would say watch some YouTube on how it's done and be super sure your measurements (corners and the likes) are on point and it really shouldn't be that hard. It's surprisingly easy to install wood floor, anywhere really. Good luck
I've got composite floor planks in the back, but I laid it over the OEM carpet and put the foam underneath it. I would probably pick up the carpet and put something stiffer underneath next time I do it, because the amount of flex it has causes it to crack at the seams. Maybe I should put the foam underneath the plywood instead. Most of the damage was caused by our dog jumping off the bunk or workstation couch, but some of it is also from us coming down hard after grabbing an item from the upper cabinet area.
If you're using a quarter round or trim around the edges, make sure you know what's behind the walls if you're using self tapping screws, especially around the sleeper AC. I think there was something odd about the angles or edges of the sheet metal under the bunk that made it hard to attach with adhesive, and trim nails will not work.
It might be better to get a one piece laminated sheet and cut it to fit. We haven't had any vibration noise or horizontal shifting, but this would eliminate that problem plus the problem that we're having. If you're wanting to use real wood, I have no experience with it in a truck. We figured with humidity and pests in different climates, we'd rather use composites.