Twobike - I am just home from a pacemaker lead extraction/replacement with a new pacemaker as well, and the pre-op routine was the same as it was for my valve replacement 5 1/2 years ago. I had an echo, an ECG (electro-cardiogram), chest X-ray, CT scan of my chest, angiogram and some blood tests. They did all this just so that they would be prepared, no matter what happened while I was on the table.
The only test, of this whole battery, that gave me any anxiety, was the angiogram (heart catheterization). I had some rather bad experiences my first time, so I made sure I told the entire team the second time of my fears. They understood, and took perfect care of me. Just tell your team what fears you may have, and they know how to make it a non-problem.
I know it seems like they do a lot of testing, some of it rather invasive, but I have come to the conclusion that this is all for the better. They get to do their jobs, with few to no surprises. Makes it better for everyone.