---I wouldn't think it would be any harder than any other engine, as they normally are placed in the same position on most US-made RWD vehicles... unless you consider
Genetic
Misconception, which we aren't discussing... thank God.
---Looks to me like the usual 7/8" hexed sensor. I know I was disconnecting both to see which one did what, while my Step-Son was watching the gauges, so they're not that* hard to get to. They also wouldn't be that* hard to get to unless you feel the need to have your hand right up against the block. I myself would go in with an extension, the correct size deepwell socket and 3/8 ratchet. I also would fit the socket with a nut, as a spacer, to save the terminal from any damage it might incur while it is against the drive end of the extension... JIC you find contacts.
---Yes, they can leak from the body. While on my Scout II, I have an unused sensor which broke off completely, exposing the slider/piston/plunger. It's been like that since I bought the truck 15 years ago and hasn't leaked yet. Guess it just depends on how it became damaged.
---Furthermore, I would try pulling it out all the way and inspecting it before you try and tighten it down to solve the leak. Chances are, if it is broken on the threaded portion, you'll snap it off and need an easy out or internal pipe wrench to remove it. That* would be a PITA w/engine completely assembled & in-car.
