Longer guide: Read the manual for the specific ventilator and have fun adjusting air mixture, pump frequency, pressure, volume and other stuff. Choose one of several different models of mouthpiece, with or without tubes, depending on patient needs. Learn about different failure modes and associated alarms. Learn how to operate the pump manually in case of electronics failure. Learn how to properly clean the machine.
It isn't nothing, there are some things you can do wrong if you don't know what you are doing. But a trained medical professional should get up to speed with a crash course.