Hi Louise
I can't help with your progesterone question, but just wanted to say that I had an abdominal hysterectomy at age 54 because of fibroids (ovaries retained) and was pleasantly surprised at how 'not-unwell' I felt afterwards. I obviously didn't lift anything heavy for the required period afterwards (my husband bought me a 'mini-kettle' for use when on my own at home!) and didn't drive or return to work for 6 weeks, but as for pain and discomfort, I didn't really have any after the first day or two. I second pp who've advised you to take as much recovery time as you need, though. My job was a desk job, so very little exertion required as long as I could get there and back each day.
My womb was apparently the size of a 28-week pregnancy, which I mention not to play fibroid top trumps

, but really just in case it might be somewhat reassuring as you're in a similar situation. The scar is quite large, I suppose, but healed pretty fast and rapidly became less and less noticeable (I'm now 10 years on) although the abdominal numbness at first was very disconcerting and did seem to last for ages.
Wishing you all the best.