Honestly, when you are bringing life into the world, especially in an artificial way such as incubating, you should give them the best chance you can by being prepared. It's not fair to those little lives to start them off without being able to give them the best environment for development and survival that you can and when you are talking about hatching, the two most important things are temps and humidity. Those two things can make or break your hatch and if you can't monitor them, you can't attempt to provide them with the best incubation/hatching environment. I by no means am trying to be mean, we ALL make mistakes, but you set yourself and the chicks up for failure if you have no means to monitor their conditions, especially temps.