That occurred to me too, and it would be a lot of work, but it's all entirely possible. The hospital bed might have had wheels, or he could have assembled in pieces. As to the tree, he might have used a Hiab truck. Hannibal's a resourceful fellow, I have faith he could pull of most of this stuff by himself.
The one thing that really bugs me, and has done since very early on in the show, is why all these extra-ordinary super villain level serial killers seem to operate in or around the state of Maryland. I mean, it's the F.B.I, they cover the entirety of the United States, why not move around to some different places? It's not like slapping "Austin, Texas" in some text at the bottom of the screen during an establishing shot is going to break the budget.