Migrating my JMP business phone number from Chatterboxtown to Snikket - is there a quality migration guide somewhere?

I currently have my business phone number on JMP through Chatterboxtown.us. Apparentlly, I now have a Snikket account set up to which I can migrate to, presumably for more reliable phone service. Problem is, I'm trying to learn what this entails and what to expect but I can't find any documentation to read through to learn. Since this is my business phone, I'm not interested in fumbling through it and learning along the way at the risk of losing service, stored messages, contact info, etc. The only thing I know is I can use the "invitation" from Snikket to get set up, but that isn't educational - it actually just creates questions.

Is there a migration guide out there somewhere that I'm missing to learn about this migration? I want to learn what happens to my message history, contacts, etc etc. I have a lot of customer history and contacts in this business account and I need to be confident what I'm actually doing.

Thanks!