First Gen Body Mount replacement

[Maltrix]

Hey everyone, so my 00 tundra been needing a mount for awhile. I got all the parts but I've never done this repair before. Just a little confused on how many mounts I need to undo etc. It's getting cold out and I want to get it done as quickly as possible. Bolts are pretty rusty too and I'd like to get it done as effortlessly as possible so I'm asking if anyone done this before and how they went about it. The mount needed is driver side under the door. Thanks