I felt the same way as you do... I was transferred from med surg unit to icu almost a yr ago. I also felt dumb at that time and also it was too overwhelming to see lots of machines and understanding different vent settings. But i told to myself I CAN DO IT... During my free hours ar home i read about care for crtically ill pts ecg ventilators and etc... And now i can say i am a good icu nurse... Just believe in yourself and do what u think is right and always be positive