Now you see it....now you don't

Trying to switch from AT&T DSL to Comcast Hi-Speed Cable Internet. Folowing the instructions as best I can but because I really don't know what I'm doing its kind of hit or miss. It wasn't working at all last night, kinda working now and who knows what happens next. A guy from Comcast is supposed to check it out around 8-10 this morning but I figured I better write a quick note before I screwed it up and it went out again. I don't even know if this message is going anywhere I don't understand at all whats going on here. The phone is totally disconnected and the cable is plugged in so I know I'm not going through AT&T but the Comcast icon is not showing, it doesn't appear that I'm using the Comcast browser, I can't sign on to Comcast but it looks like i'm on the Net. Like I said before, and I sure didn't say it first, some things you don't understand you just have to accept. Maybe the Comcast guy can explain it to me and get me all set up but if you can't get a hold of me its because 'Now you see it, now you don't'. I'll try to get on this blog later today. This is really all I can handle and think about this minute