Boiling is considered an optional step. For my long perches I boil water and fill my sink with it. I then let the perch soak for a while, using tongs to rotate and keep it under. I add more boiling water whenever steam stops raising. After about an hour of this, I scrub it. I scrub hard!! Then I put it in the oven at 200 for 3-4 hours, rotating every hour. I check it by knocking it against the counter. If it makes a thud then it's still wet (if you want a good noise to go by, do this before you put it in the oven) and if it makes more of a thwack, then I know it's dry. I put it back in the oven, turn it off, and leave it over night. I always let my wood sit at least another day on a pan just to triple check myself. All that's left, in my process, is drilling and putting the hanger bolts in. Good luck!
You need to make sure that the pear tree doesn't get sprayed with any chemicals. If it does, you need to scrap the idea entirely for that tree.