I would roll it up on the roller and then un roll it just like any large piece of fondant.Or you can use your arms. Thats what I end up doing because the fondant sometimes sticks when rolled up. Good luck with it and show us a picture. I'd love to do that myself some day. :)
That is how I do it pick it up with arms but its so large it begins to tear. I guess I will just have to move faster. Also, two of us picked it up.
AMake it on a piece of cardboard, then, when its time to put on e cake, just slide it off!