When I was working on my float to get my gas gauge to work I got my brother to help me lift the bed one time another time I had a friend help me.
It's really not that hard.
I used an old fence post to hold the bed up once it was lifted.
I put ratchet straps onto the corners of the front part of the bed, to my door latches to make sure the bed didn't blow over or anything like that.
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Plenty of room to work under there.
Hopefully the picture will help you understand.
You don't have to unhook your tail lights or anything like that.
The hardest part about it it's breaking the bolts to the bed loose.
P.S.
Don't forget to undo the fill neck to the gas tank.
It's 3 little screws inside the gas door, on my truck.