We benched it i thought it was the easier way. Perhaps some with first hand experience trying/doing it in truck will pipe in.
I can say the following with certainty.
It's a big heavy cumbersome MF'r, 2 men will serve you well. Watch out for the servo/sensor (whatever it is) on the front its made of plastic and isn't as tough as it looks. IIRC- the upper mounting bolt will IMO come out easier from the fender well drivers side. I took mine out from the top, you may have to loosen the motor mount to get it out from the bottom. It kinda spins out of the hole it doesn't drop srtaight down IIRC. Put most/all the fluid in it before you put it back in.
Good luck, $800 is not a bad price congrats!