I think it is easy but I obviously don’t have your physical problems. IMO if you can get the weight of the fondant falling off the “step” to open the cut the slice can be severed by many light cuts. (I don’t use a serrated blade as I have always assumed it would make it harder as the serrations clog up but I have tried dipping the blade into water which made it easier, but messy)
Edit - I’ve just cut up 2 boxes of fondant - one using a serrated bread knife and one using a sharp carving knife. IMO the carving knife is better as it doesn’t snag in the fondant.
I use pallet wrap as it’s more robust (and cheaper) than cling film and I’ve never had bees take it into the brood box.
Having it already cut, makes it easy to just open up, reverse the crown board ( I have 2” ekes screwed to the upper side of my crown boards) uncover one side and place that onto a QX or sometimes directly onto the top bars as I want the bees to store it in the combs as easily as possible.
I only put it above the crown board for emergency use, stored in a takeaway box within a PIR insulated pocket which the bees can rob at any time they are active during the winter. They will not break cluster to forage above the crown board during very cold periods so it’s imperative to get the stores into the comb they are clustering on.
Edit. I’ve just thought - by having it prepared off site you can cajole/ press gang a friend, relative or even a small child into preparing it!
Mmmmm now there’s a thought.