Great walkthrough
I had to replace mine a couple of months ago after I stupidly placed it on my workbench without cleaning the surface, and a sharp sliver of metal pierced the sheet...
I usually put down some paper towel before setting down the vat, but the roll was out just minutes before and I just went ahead. And regretted it immediately.
The original FEP had been on there since I had bought it (Mars 2 Pro) two years ago now. It was scratched and even dented in a few places almost from the beginning (because of hamfisted me not cleaning it properly), but I never had any issues or failed printes because of them.
Also; my printer came with two replacement sheets, so I didn't even have to order anything...