If by expert you mean cause I have been building them for the past 30 years and averaging 99% hatches....then yes I am. Well my advice is don't use light bulbs as your heat source they burn out and you don't notice them and your eggs get too cold..
.The incubators i just lost in the fire, I built 30 years ago and the only thing I ever had to replace was the wafer in the thermostats....
I have seen light bulbs explode when water dripped down on them from too much humidity and yea it destroyed the mans hatch...He came to me to put him a heating element in and take the lights out.
how do you use a heating element? and what kind? stove? waterheater? electrictskillet?