I'll be joining you on the hip replacement train in a few years I'm sure... I had 2 hip surgeries due to labrum tears. The last surgery was 15 years ago, and I still have the same challenges you face. There are certain movements I will never do with my left leg, because of the instant pain you described in point #2.
If Buxton's experience is similar to what I went through before the surgeries, he is likely dealing with a dull pain that lasts all day and night on top of the knife piercing pain if you make the wrong move.