I made the transfer between my truck and the seller’s truck with us and two friends, each person on a corner. It’s very manageable with 4 people. It might take a bit of effort to break it free from the bulb seal, but once that’s done its not hard to move. Plenty of places to grab and lift the tube frame.
A few other tips:
Get a new bulb seal from one of the links in the thread that @d.shaw linked above. Measure the center to center distance between the camper tubes that lie along the bed rails. That measurement should be your guide to laying down the new bulb seal on your truck. You want to aim to have the frame tube lie right in the middle of the bulb seal.
The rear hatch seal is different between 2nd and 3rd gen tacomas, the latter being a much smaller piece. If your truck is not the same gen as the seller’s, you’ll need to get a new one of these. I’ve heard you can reach out to GFC and they’ll sell you one, or you can buy directly from trim-lok. I think DD1201 is the product# for 2nd gens (the picture on the website looks correct but I can’t confirm).
If you have a 2nd gen, some people recommend getting new bed rail caps from KB Voodoo. I bought them, but they didn’t show up in time before I installed the camper. It’s sitting on the stock plastic bed rail caps and they still look fine - no bending or warping.