Nickel will be set of tools written in python to interact directly with NIS.
https://github.com/NewEconomyMovement/nickel
how do we find our private key?
I don't think gui currently allows to get it…
…but, you can "add existing account", enter private key[1], and send some NEMs to that account
[1] - you can use sha256 of some string, although be aware, that such method is ok for beta testing, while in real life someone, could use dictionary to find it out your priv key and stole your NEMs
