To remove the drivers side inner fender I believe you will have to pull the steering column. I removed mine by taking the steering wheel off, unhooking all the linkages, wires, etc, and then unbolting the column from the steering box at the rag joint as Don said. I also unbolted the mounts on the inside of the cab and the one on the firewall to allow some wiggle-room. Then with a little convincing it came out into the cab.
I don't know what condition your cab is in but I would advise soaking the cab mounting bolts thoroughly ahead of time. They aren't something you want to use a torch on being the mounts are largely rubber, and I ended up twisting a couple of mine off because I didn't pre-soak them and didn't have the patience to wait...
After that Don has covered everything you need to unhook to get the cab off.
I would recommend getting a few friends to come over to lift it off rather than attempting to remove it yourself via a cable jack suspended from the ceiling or similar methods. They can end very poorly, as a couple people have discovered the hard way.
