Ask the HiveMind: Google+ API horror stories?

Have any of y’all ever gone through the process to get a Google+ API key? Any pointers, or is it pretty straightforward? (A girl can hope, right?)

And, what did you do with it? How easy / hard was it to use? How sorts of ritual sacrifices did you have to make?

Basically, I’m looking to hear about any experiences with the whole process, if you’re interested in sharing.