2, How to remove the old alternator:
Note: I didn't do this work myself, I don't have a garage and it was too cold to do it outdoors. I took the car to the workshop. I just give some hints here.
After you have disconnected the battery, always the minus cable first! You can take away the filter cover. Put something over the air inlet to the engine, you don't want to drop something into that hole!
The serpentine belt has a spring loaded idler pulley at arrow 1. Below it is a nut, arrow 2, which can be rotated to release the force from the spring and then pull the serpentine belt aside. Take a photo of it before so you know how to put it back.
Just an ordinary tool. Note you must disconnect the battery before, you don't want to loose your fingers because that the electric fan start, very dangerous! Always disconnect the minus cable from the battery first !
As you see there isn't very much free space here. I got a tips from the Crossfire Forum that there is easy to remove the radiator fan with its shroud, two clips and a cable with a plug.
It can be a bit tricky to find the nut below there, it has the size 17 mm.
The alternator has these strange bolts, inverted TORX, you need a female tool. The size is E14.
Spray some rust solvent on the bolts threads before but not inside the alternator. There is another bolt downside where the arrow point. Don't bent the nearby hose and crack it.
How to proceed from here I'm not sure of because I didn't do it myself. But you have to disconnect two cable on the backside of the alternator, one thick with the main battery cable and one with a socket to the field terminal.
Here I have found a video at Youtube that explain in more details: