First off how did you just buy a comcast self installiton kit did you get it from comcast or like ebay? I have adelphia cable internet and I ordered it online and went into the local adelphia office picked up the kit and it is just cable wires, usb, ethernet, cable spilter but not the cable modem you buy those yourself. But I already bought my cable modem ahead of time like a few days before I picked up the kit. Then I had to call adelphia and give them the MAC ID at the bottom of the modem so they could put in into their system then well la it works. Also I had to wait a week extra or so tho before I even had the internet becuase they had to go outside my house and untrap wires in my area they are traped for some reason. But I doubt you will have to thats just where I live. But my service wasnt charged during that time. But yeah cable is easy to install just plug the cable into the cable outlet then into the modem then plug the modem in then run either the usb or ethernet cable to the comptuer or you can run an ehternet cable to a wired or wireless router to share the internet among serval computers. I hope this helps.