Agreed, shock are not hard to replace. I did it with just simple hand tools (Wrenches and ratchet/sockets).
What I did to install them was:
Backed the truck up on my ramps, rear tires only.
I jacked up the front, removed the tire and then supported the chassis/frame with a jack stand. This allowed the front suspension to "streach out" and give me more room to work.
Removed the front shock. On the Excursion, the top nut is a 15mm, and the bottom was an 19mm.
Replaced the front shock. Repeat for the other side.
Rolled under the back, removed the bottom bolt, 18mm and the top 2 bolts from the chassis, 10mm. The Ex mounts the rears differently than the F-Series trucks. Replaced the shock, repeated or the other rear shock.
I believe it took 1.5 hours total, this was from putting the truck on the ramps to putting the tools away.
The only difficult part is the fact these are gas charged shocks, and are difficult to compress, and once compressed, they start to extend quickly. So you have to work quickly to get everything lined up. Other than that, it is not difficult at all.