I have removed the evaporator in my focus and it wasn't an easy process to do. You have to remove everything from the front of the car including the seats (can just drop the steering assembly).
As for the connections they are located in the middle of the engine bay right on top of the firewall. You will have to remove the tube from the air filter to the throttle body to gain access to them. You will also have to get special tools to loosen them to remove, seeing as they are held on tight with a spring. If this is something you haven't done before it will take you the longest time to do in my opinion.