I just did a wham-bam-thank you mam weekend engine swap, pulled a dead 7.3 from my blue truck, pulled the good 6.9 from the black truck, dropped it in the blue truck, and drove it to work monday morning...
I learned the hard way, that although it is probably possible to pull/install the engine with the turbo on, if you're single handed such as I was, it makes it alot easier to get the engine lined up to the transmission without the turbo causing grief by getting intimate with the firewall.
I decided not to pull the front clip off either trucks, since I wanted to keep my a/c functional on the blue truck. If you go this route, make sure and put some plywood behind the radiator to protect it from the water pump... This saved my radiator.
Work through a mental checklist, and go over everything individually. Electrical, Fuel, Power steering, Exhaust. On my '85 truck everything came to a halt mid-pull. The engine got caught on something and wouldn't budge. My wife was standing off to the side and said "hey that wire looks like its about to break" There is a ground strap on the back of the passenger side head, between the head and the firewall. Couldn't see it before the pull...
I also unbolted the hood springs and held the hood open with a 2x4, to get a little extra room under the hood...