Hi Sarah,
Just my experience, maybe I'm lucky, but I held off doing any body hair removal, including chest and back until over a year on HRT.. and found that I did not need to pursue it. yay! One bit of less pain, agony, and expense.....
At just over a year into HRT, I considered laser/electro for 'patchy spots', but I held off, and 2 years in.. I don't even think about it, there is no need. At your age, I would guess your results would be similar, but we all react so differently, eh?
Best Wishes,
Melan