If your coax has been physically disconnected you need a tech. If you are moving into a place that already has an active line, then you don't need a tech. Comcast should know if the line is physically connected or not, but sometimes they don't.
Welcome to the forums. The information provided by @Nerdburg and @ComcastAmir is correct. However, I'd be more than happy to see if there's any way I can assist you. Please send me a message by clicking on my name, "ComcastChe" then click send a message. In the body of this message please verify your first and last name, and the name of the account holder if it's different than yours.