Hi Lauren Lee - welcome.
We've all gone through the same questions about having the surgery. It's major surgery and a major change. But I think it's a change for the better, much better in my experience.
There were many days when I woke up before the surgery after a bad day feeling better. It was relative and hopeful in my part, since the pain had increased as the days passed. If I worked out, somehow my leg(s later) felt better so that I only had pain a few times rather than continuously, I thought that was livable.
I did put it off for years. The onset of discomfort to pain to excruciating pain didn't travel a linear path that I could use to predict that: yes, here is the point where I have surgery. At first it wasn't diagnosed correctly, I had physical therapy, just worked out harder, didn't do anything, went to workout boot camps, tried different diets, shoes, stretching... a long list.
It was seven years after the first twitch that I got surgery. By that point it was clear I needed something and went to three surgeons. The first two insisted on THR, the last said I was perfect for HR. All agreed that both hips were bone on bone, the worst was dislocating at will (I was 'popping' it back in as needed) and I still tried to find a way to avoid surgery. But it wasn't happening.
The thing about this is that it does not get better. Once the cartilage starts to go, it won't be back and will go completely in time. Hopefully medical science can someday regenerate cartilage, but now there is no alternative.
The good news is that the treatments are capable of completely erasing that pain and the damage. I chose HR because it had the possibility of restoring me to being physically active, putting me back together with the parts of my life that had been winnowed away by the OA.
Several here have changed or deferred their surgery dates. It is purely your decision and should be supported, since you are the only one who can decide when things are right for your body. It is major surgery and the recovery is not a cakewalk, but it is progressive, and the OA pain is gone from the start.
My advice, having done two is to go ahead with it. It has made a huge difference in my life and that should always be considered; being able to walk carefully because you're avoiding painful possibilities is not the way I wanted to live, and I'm sure is not true for yourself either.