Tom,
As you may remember, I had the same surgery in 2005.
I have a seven inch scar on my left arm where they removed a vein to replace one of my clogged arteries. That scar is a daily reminder of how fortunate I was to have that surgery. Nowadays they snip the vein on both ends and pull the vein out one side leaving no long scar. Fortunately, you will remain as handsome as ever.
Be sure to do the breathing exercises, religiously to get your breathing back to 100%.
It will take a while, but you will be fine.
We need and appreciate all you do for our hobby.
Best regards, Neil