The scar area numbness and hardness are pretty normal for THR. At least I can vouch for anterior method. My LTHR took about 2-3 months for the scar area to be 'soft' and about 12-15 months for the numbness to mostly go away -- it is now the size of a penny, and I do not notice it. My recent RTHR scar has the hard to the touch surface, my physical therapist told me to massage it myself in a round motion to break up the scar tissue. The numbness on my right thigh is not 'on' the scar, it is below the scar, it has gotten smaller. I think it will eventually disappear more or less also.
My surgeon is very clear with directions, so I had written instructions for everything, about 10 pages worth. And they were worth studying. In the case of using the TEDs, I was instructed to use them 18 hours per day, off during times when I was walking around or a bit active, but on during the night. As it turned out, he changed the protocol for clots, so I injected myself for a month with Lovonox. (there were clear directions for that, although I had two nurses show me how to inject it before I started myself). Last time (LTHR), 20 months ago, I took a small new pill, but they are not in favor so much with my doctor at least. He told me that aspirin plus TEDs or Lovonox alone were more suitable to prevent clots.
That's about it. I am almost exactly 5 full weeks over my RTHR, and I've had my third outpatient PT session (after about 8 in my home). I see my surgeon for the first time next Weds. I am doing so well, walking with almost no pain and no help. This miserable hip stuff will hopefully soon be an unpleasant memory.
Good luck to you.