CEs are simple enough to perform. Two part process, beginning with pressing A+B+K and making the blow connect, the other part being inputting the follow-up command on the final blow of the initial combo. The rest is timing and practice. It definitely isn't the hardest thing to pull off in a fighting game, and they're damned awesome when you do.
These things, I remember them well, would make for one hell of a rush trying to pull one online if they still used it.
I could do seoung mina's all the time, other characters had me though, its all about timing!
They were pretty simple. Setting A+B+K to a button would be easier. I accidentally peformed my first by button mashing believe it or not. Voldo's is a good one to use if you're tryin to get used to them.