Before we begin in a couple hours, I have a few last points to ensure this goes pleasantly--as I've already crash-coursed in Skype group calls.
1) Firstly, there must be a moderator. Someone who everyone knows is sort of guiding the flow of the discussion. Otherwise some talk endlessly, some never get a chance, or everyone wastes time talking at once. I'm happy to take that position in this call, because I'm very familiar with it. I may not even need to do anything, but I'll basically pay attention to who tries to speak and ensure they are heard. For those who are less assertive, there is number 2.
2) While you're in the Skype call, you're still capable of writing to everyone in the chat window as well. So, if you have a strong inspiration to express something, you can simply type "1" or a few words--just something that shows you wish to talk next. It's like a talking stick. The moderator will ensure you get your chance to speak next.
Within 1 or 2 calls this all becomes natural and flows very beautifully. Simply the experience of harmonious discussion is pleasant.
Cheers