Cortisone shots did not work for me as my hip was too far gone by the time I had the two injections. I also have heard from several doctors to go easy on the shots as they can have a negative impact on the joint if you get too many injections. And I am not sure what was worse, the surgery or getting that huge cortisone needle shoved all the way into the hip capsule.
I am a 41 year old male, FAI in both hips, left was worse, and was also very active before surgery (running, cycling, surfing, skiing, hiking, weight lifting). I just had all restrictions removed on my operated hip at 2 months post op. Overall, recovery hasn't been that bad. The first two weeks were brutal, embrace the pain killers, but once I fell into a physical therapy routine, the recovery has been quite amazing.
I am hitting the gym with a pretty heavy routing of stationary cycling, rowing and weights now. Hoping to get some skiing in before the season is over and get back to surfing in about 3 months. Daily running in about 6 months.
As others have said, do your research and find an experienced surgeon. I drove 200 miles to have my surgery done by a surgeon who as done over 4000 hip resurfacings. Finding an experienced physical therapist, especially in hip surgery recovery, makes a huge difference as well. They really give you targeted exercises to get back that quad, glute and hamstring.