The directions for mine said to unroll the cover and turn it inside out behind the trailer, and fold sides in so cover is about 4 feet wide. Tied a rope to the front "loop" on the cover. Got up on the roof and pulled the cover up the back or the trailer as wife helped guide the cover up. Pulled cover all the way to front so that "roof section of cover" was positioned on trailer so roof section was equally placed on roof and hanging over a bit. Push side sections down and wife helped to guide them into place.
For the gutter spouts, I used tennis balls and split them to fit over spouts. For any sharp objects on trailer I used semi-rigid 1" pipe insul. from Lowes. used at some corners, steps and rear hose bumper ends. I also have a ladder so I used pipe insul. at side of ladder at corner of trailer, so ends of steps would not poke holes.
To remove just reverse process, lift sides up and fold in along center of roof, rollup form rear to front of trailer and just drop off roof.