Use 63/37 lead solder and I like to solder about 800-840 but that's me, I'm on each connection for less than 2 seconds and get nice flow and fillet.
Lock the solder when you're done up somewhere where the kids can't get in. You're not vaporizing lead until you get well over 1200 degrees so there's not going to be airborne lead (just airborne flux which isn't great either, but you get that with lead free solder, too, and possibly that flux is more caustic than the leaded stuff to get the lead free to flow better)