I was able to install it by myself and it took me over an hour (mostly because I stoped every few minutes to take pictures for this forum.) As Road Toad said, It's easy to take the back lid off. Just two bolts and lift up. The back lid is mounted on a bracket that has everything connected to it.
I figure once you know how the front lid goes on it'll take half the time to put it on again. There is just ~7 bolts/screws to remove the front lid and suport bar. You might get by with not installing all the bolts but it would not have as good of a water tight seal against the back cab.