Thank you those type of trees do require a little blood and sweat when top working.
Yes some pears do seem to have a little poison in their thorns. Cactus and blackberries feel that way as well. Fortunately this pear is very thorny but the thorns do not seem to cause anything more than scratches. The hardest part is cutting the initial path in towards the trunk to reshape the tree. The callery trunks are really something! These trees are completely neglected never sprayed or taken care of in any way. Completely immune to fireblight which I find impossible to believe and yet it's true.