Yeh i know what you mean, took me a few weeks!
It's really simple though, fill in a two minute form online, give them your insurance number.
Then they phone you up to confirm and take payment of the excess.
When the guy comes it only takes about 30-45 minutes, and you'll have a nice shiny windscreen
I was really happy with mine, as my old one had 12 years of abuse and 130k miles of stonechips on it. Now i can't even see it's there it's so clear