Yep, bucket lift. You're not going to climb a conifer with ropes and pulleys like you could a hardwood. I suppose a polesaw method would be possible, just seems like it could be a real pain and take 2-3x as long. Cheaper than renting a lift, I guess.
I have a friend with a large pine in his front yard that he strung-up the first year he lived there, and he never took the lights down. He said they're weatherproof and "constant on" so the entire string doesn't fail with a single bulb going out.
I asked him about the wires being chewed on by squirrels and critters, and he shrugged and said it hasn't been an issue and they haven't failed yet. They've been in that tree for 7 or 8 years now.