My husband had both procedures done over 20 years ago, I can't recall him feeling a lot of discomfort, he said it wiped him out for a few weeks in the aftermath. I think he's very fit for his age, slightly underweight now, always having to tighten his belt, so jealous of that
plays golf several times and week and is often busy in the garden with physical activities when he's not doing that. I'm over ten years younger, I'm quite sluggish in comparison, under active thyroid 
He put his blocked arteries down to being a smoker from 16 to early 30s when he binned his last packet one New Year's Day and has never hesitated to tell our sons that when they started smoking late teens twenties, both have now stopped.
Very good luck with your forthcoming procedure LuckyGirl.