My experience with that pear I did last year i'm taking into this spring to do an apple as well. I waited for bud to break which meant bark was slipping great. Peeled it back, stuck the scions in, wrapped it and pained it with i think those were wax covered. I did leave nurse branches as well, the scion healed in great and some grew as much as 4-5 feet. Nurse branch helps big time, if you don't have 1 the tree can supply to much moisture to the scion and actually kill it just the opposite of them drying out.