hygrometer placement and humidity levels

I am planning on setting up my incubator a few days ahead of receiving my eggs to make sure my levels are accurate. I am confused about a few things. I will be using the dry incubation method and have read the article, but i need some things clarified I have and LG still air....First, I bought my accurite hygrometer today. The room that I will be having the eggs in reads 29% humidity. Do I need to have a humidifier in the room to up it to 40-50%? Or should I add a teaspoon of water to the incubator to up the humidity in there? Do I need 2 hygrometers? One for room humidity and one for incubator humidity? According to the article, you should only need one ROOM hygrometer and as long as the room humidity is 50% the incubator humidity should be ok....(this is for the first 18 days)Now, the last three days I know the humidity is supposed to be a bit higher. Do i just add sponges to the incubator, or close the vent holes? I think after reading this, I almost need 2 hygrometers...Can someone clear this up for me? My head is going in circles!!!