Peeps - We have a lot of SLN trees on Antonovka too. They've all done well for us. Following the advice of Maya and Appleman, as well as others here, I didn't go crazy cutting off all lower limbs right away. Those gents advised keeping some of them on until 3 to 5 years after planting to let the trees get established and develop good root systems. The limbs and leaf surfaces aid in growth from photosynthesis. Basically, "don't cut away the sun collectors." I just remove a low limb every March until I get the lowest limbs up where I want them.
So I waited a few years to remove some of the lowest limbs - with good results. We have bears, too, so I keep the lowest limbs at 6 ft. or higher, just to avoid casual "reaching up." We've found the younger bears are the ones most likely to want to put their paws on things, reach up, snoop around, etc. 6 ft. or higher limbs minimizes the "easy reach."