A friend of mine managed to get all the way through his start up checks on a JP3/4, called for taxi and got clearance, waved the chocks away (ground crew bemused), pushed open the throttle and ..... nothing happened, not even an increase in noise from the Viper. He had actually omitted to push the start button. Unfortunately it was a dual trip and the debrief was not friendly.
Basically, FP, learn the lot. Everyone on your course will be doing the same so you won't be alone.