I also make soap. I have a back, screened in porch. I measure my FO or EO out on the porch and leave it there while I make the soap. When it's time to add it, I take the pot to the porch and stir it in. Then I take it back in the house and mold it. We haven't had any problems. I have a large, old, and well-ventilated house though. If I was in a small area (like an apartment) it might be different. I also mix my lye and liquid on the porch and don't bring it in until the fumes are gone.
As to candles, I gave them up when I got Timber. Since I'd read I couldn't burn them (or use on a warmer like I did) I just quit making them.
I'm no expert, but that is what works for us!