I have 2 Brinseas...I dry incubate and don't add any water until lockdown. (I have the turner and the water would spill out as it turned.) We heat with wood, and although the incubator is not in the same room as the woodstove, the ambient humidity is very low. I probably operate at 20-30% humidity until lockdown, then shoot for 60- 70 %. The humidity will rise somewhat as chicks hatch. Don't open the bator when there are chicks pipped, or zipping, or you risk shrink-wrapping them. If you get a lot of condensation on the inside of the top, you might need to slide the vent open a bit more. I think you are supposed to start with it open about 1/3. I bought a thermometer/hygrometer from Lowe's and used it the first few times. I always turn the incubator on a day or 2 before I put the eggs in if possible so that the temp and humidity will be stable. Resist opening the incubator once you have the eggs in, except for emergencies...like removing a stinky egg. When you open it you lose heat. The longer it is open, the more heat you lose.
This is what I have done for both chickens and quail. It works for me. Good luck, and don't worry too much.