When you initially attach to the base of the tree, before climbing, the stand needs to slope toward the tree so that as the tree narrows as you get higher, it will level out. You have to guess how much to slope it initially but with experience you will get better at judging this.
As for packing it: the seat portion stacks on top of the base portion and then you use 3 or 4 straps to cinch the two halves together. From there, you should have straps to pack it into the woods. If they are not on the stand, you can buy them.