New Comcast cable, do I need "Professional Installation"?

I want to get rid of ATT, they failed to repair my line. Now I have very low speed. I am planning to change to Comcast cable based internet, I see the plans list on its website. A service called “Professional Installation for one computer” is bundled with plans, is that a service for a technician come to your house and connect modem to your computer? And it costs $99, anyone who have Comcast cable but did not pay that money?

I know well about DSL modem settings, most brands and models. But this is going to be the first time for me to use cable internet and cable modem. I have ordered a cable modem, it will arrive by the end of this week. I just want to avoid wasting of money on modem setup if I can. Is cable modem can be set by a nonprofessional? Or only technician from Comcast know the setting which works its cable? Please give me advice, thank you.