Think SAFETY.
There is nothing worse than having your car fall on you. Jack Stands and a jack is all you need. Sears normally has a jack and stands on sale, if not most of the auto parts stores do. Never get under a car without it being properly secured.
You want to raise the car up until the tires are about 1 foot off the ground. If I remember correctly, it is on the driver side of the transmission (near the top) and please remember that the transmission is in the rear of the C5. The kit contains a male and female plug that are usually connected together. Separate the two plugs, get under the properly braced car. Locate the CAGS plug, disconnect it. Connect the male to the female plug included in the kit. Connect the female to the male included in the kit. Using the zip tie also included in the kit, secure the loose Cags wire to something that will not put it in contact with the exhaust.
It is an easy job. It took me longer to jack the car up than it did to install the override kit. In terms of complexity I rate that job to be a 1 beer job.
Guys please think safety, considering how low our cars are, unless you are Twiggy, you will get hurt.