As a very occasional solderer, one thing I don't see written about much in beginner guides is ventilation.

With lead-based solder, I'm never sure what I should be doing, especially in a small room/workshop. Keeping windows open or having good airflow isn't always possible.

Things like: should I avoid leaning over or breathing in while leaning over something I'm soldering? Do I need to air the room afterwards? Would a small carbon fume extractor help? Anything to worry about from other chemicals in lead-free solder? Or is even lead harmless enough for someone that's not soldering ever day?