How does staking work, from the user perspective? Is it as simple as holding coins in a wallet and keeping the wallet running? I decided to mine a few and see what happens. I'd like to stake what I mine. How do I do that?
You hold coins in your wallet, either un-encrypted (not recommended) or encrypted and then unlocked with the box checked for "staking only." Once your coins mature (min 24 hours, takes longer for less than 1 coin as others have experienced), they will then attempt to stake, if they don't stake, their "weight" increases. They can only stake once per maturity period (roughly 24 hours).
The lock in the bottom right corner will be unlocked when you are able to stake, then you can see if your coins are mature by hovering over the up arrow.