What's the difference between Simula One, Simula One Tethered Edition and Founder Edition?
Simula One: headset + compute pack, works standalone
Simula One Tethered Edition: just the headset, needs a host PC
Simula One Founders Edition: headset + compute pack, works standalone, has extra bling (and potentially slightly better specs as they can make more lead time vs cost tradeoffs)
As for doing fit testing at home, using cigarette smoke might be helpful:
"... it was found that tobacco smoke as it comes from a cigarette is an extremely concentrated aerosol with a relatively stable distribution of sizes ranging from 0.1 to 1.0 micron, peaked between 0.2 and 0.25 micron."
I subscribe to podcasts and watch a couple video presentations.
The idea is to quickly get an understanding for the concepts behind the language, when you dive into the topics you already have a mind map to file them under. This also gives you a feeling for the community.
Next I read the top questions on stack overflow and join the IRC channel on freenode.
By learning from the common pitfalls made by others this saves me from a lot of startup frustrations which would otherwise prevent me from actually using the language.