Well a little research before I asked the question would have partially answered my question. I had ordered and received the replacement beading from Moss several months ago but had never removed it from the shipping tube. I just assumed all the pieces were straight since how else could they be put them in a 3" diameter cardboard tube. I assumed they had to be bent when installing them.
Turns out British Recovery was correct. The rear beading is cleverly twisted so it can slide into the tube. When you remove it, it has what appears to be a curve that will perfectly match the rear of the fender. Not sure how they did it but I was able to remove all four pieces and them put them back into the tube waiting for the time to install. You still need to add the minor bend to the bead right behind the door opening, but that doesn't look to difficult.
So it looks like the installation won't be a difficult as I was expecting, but I'm glad I posted the question. I now have a better understanding of the best way to protect the new paint.