trellaine,
You'll be fine.
When I originally signed up for D*, I had everything set up, and a picture on 101 (as it should be).
I called D* and told them I'd like to turn on service (and I was a new sub at the time).
The lady I spoke with said that it was not possible for me to do that, that they needed to have someone out.
I told her again, she found it hard to believe that anyone could do that without a D* tech.
Once I convinced her that I had a picture and signal in the 90's she turned it on.
Sometimes they don't understand, but other times they are great to deal with.
Give them a call when you are ready, you'll be fine ...
Jimbo