99 deville d'elegance tune up

would appreciate any help in what to remove to change plugs and wires. Just bought the car and it has 100K on it. thanks

It's really simple. Remove the silver coloured plastic cover, that sits on top of the engine. It has 4 small bolts. When this is off, it is very easy to see all the wires. Just change them, one by one, and follow the same wire routing as original.

Plugs are easy enough to change. They sit in deep wells, so you need a spark plug socket with a rubber insert that grips the plug so you can pull them out.

looks like I need to relocate the coil pack to get to the back plugs. Is that correct?

Yes.