Steig - I have a 30 foot round pool with a 30 foot cover, now when i first received the cover, it was probably 32 feet big and curved up the walls once on the pool, I went and cut it so it's within an inch of the wall all around and floats perfectly flat on the water.
Ours was a cynch to remove, get in the pool, start rolling it up, once you get half way, stop moving forwards when rolling, rahter pull it towards you and roll so it gets rolled in the center of the pool.
Once all rolled up, I would start at one side and just lift it over the wall working my way along it's length until the whole thing was thrown over the wall and sat on large hooks that I bolted to the uprights.
To get it back on, I would reach over the wall from inside the pool, starting from one end and pull it back over and in, get it to the center and reverse the process.
Since then I have installed a reel at the far end of the pool, about 4-6" higher than the wall, and about 1 foot beyond the wall - now i can roll and unroll it by myself from outside the pool which is really nice since my kid likes to go swimming ALL THE TIME and I no longer have to drop what I'm doing to go and get changed etc etc... to open the pool