I had a heart cath done about two months ago. I was pretty scared, but is was really easy. the actual worst part was having to stay on your back for several hours (mine was five) with very little movement. Good luck on it.
@MissingNotes: really the only problem is the cut down in the groin to place the catheter... they make you lie still on your back forvsevrral hours to make sure there's a good clot
I had one done and then a Stent implanted Ted in my left anterior descending artery which saved my life. It was painless and quick and I had a fast recovery. Mine was due to a minexpensive was due to a massive heart attack. That was three and a half years ago and I am still doing fine.