This is by no means advice, just sharing my experience. I had a triple bypass 20 years ago, a pacemaker 5 years ago, and a hip replacement just last year. I also appear to have HCM with latent obstruction (waiting patiently to explore that).

Hip surgery is much leaner and cleaner than it was even a few years ago. Specifically, today's anterior (from the front) approach allows faster recovery and better results. (It also requires a special surgical table, which not all orthopedic surgeons have available.) Initially, I was very apprehensive, and put off the surgery much longer than I should have. But I started "researching" (Youtube and Google were my friends) and eventually became comfortable with it. I sailed through the surgery and recovery (by myself, no one else to help), and today it's like the bad hip never existed.

The most important points I can make are (1) I knew from previous surgeries that I tolerate them well, even with my cardio problems, and (2) I had confidence in my surgeon, who has done probably thousands of such surgeries. Compare these points with your own situation and do your own research of up-to-date information on the internet. To understand is to become comfortable.

Good luck! I hope your outcome is as satisfactory as mine has been.