You will be surprised at the weight of the bed, or the lack of weight of the bed, lol
Tailgate is probably 20% of the weight, and you can take that off first, no bolts just take off the straps, and one hinge is slotted, line up the slot and lift out the tail gate
You can also remove front 4 bolts then loosen the 2 rear bolts in the bed, leave them almost all the way unscrewed
Then you can then tilt the front of the bed up and use 2x4 or other post to hold it up
But this depends on what rear bumper setup you have, and its for two people
Sliding the bed back is for one person, or two, just go from side to side lifting and sliding, so wiggle the bed back