I also have a Skype appointment, although beginning of May. Just say it how it is. I think since they called you and asked to set up a Skype appointment, you are more than half way there.

I assume you have/had to send in some forms and passport photos ahead of time. I am having trouble deciding which way I want to go for aquiring. If I could find a local DG, I would assume (s)he would be less than $5/gr