I am worried about not being able to turn the eggs enough. I am only at school for 5 or 6 hours. Will I still have any success with hatching? Also some pict of peoples homemade 'bators do not have turners. Is it OK to open the door to turn the eggs. And one more I only have a digital thermometer, how can I try and get the right humidity? This is for my preschool class, and I have very little $$ to spend on this project.