Well, there are some very real scenarios where magic smoke can be released if you don't line pins up correctly. There's a good amount of current available at 12v on some of them thar pins. And we're strictly talking about 5-1/4" drives. 3-1/2" drives are another story altogether.
Probably not. Both are likely recipes for disaster.
Neat. The next things you'll want are ADTPro and CiderPress.
You bet. Good luck!