How hard to install floor pans on 65 A-body 4-door

[wh23g3g]

I ordered front driver's and passenger side floor pans for my 65 Valiant. The passenger side is the worst of the two even the back on the driver's side is totally gone almost. The rear passenger side floor pan is perfect. I don't know where I will get the rear driver's side pan hopefully one they make will be close enough to work with. I'm thinking the hardest part for where my car is located is being able to cut the pans out. I patched some notebook paper sized holes in my 73 Charger. How difficult is installing one of these pre-formed floor pans? I would have my friend do it for me but I was just wondering if it was better left to a body shop. I know it will be so expensive.