Good advise everyone. I'm thinking all of use installed our own.
I didn't use ramps because I would then have to stand on something to remove and install them. I'm a klutz so I just jacked the car up enough to support the cats so they wouldn't drop then I dropped the car. As mentioned the driver side from the top. The instructions said to install the passenger from the bottom. I swear I didn't! The studs on the cats are removable so you don't have to mess around with trying to stab the headers and bolt them on to the cats at the same time. I did have to move some things around to get the passenger in from the top but it saved me from having to work with an elevated car in my garage. I did the install by myself and all went well as things go.... grab the advise from all and sort out the details. And! I did "DT" shorties......might be different with other headers,,,Good Luck!