I do my big spraying projects out in the garage or back porch. There's an open door just to the right, off frame, leading to my back porch with open widows. Also, I have a couple open windows in the room where I'm spraying that creates a good draft leading outwards.
More importantly, I'm just using a light dusting of toner and it doesn't travel far. I'm also doing small sections at a time. It's much easier to control the toner that way. Something I've learned after making a few mistakes - use toner very sparingly!
Before the toner, I applier the lacquer sanding sealed with a brush so no spraying. For the final coats of clear gloss spray lacquer I will take it outside.
I finished off the backside and bottom trim over the weekend. That leaves the top edge to tackle.