Like other posters have said, just look at what your twiddling with! I fly with a Captain who on line training started number 1 engine instead of number 2 (737 if you hadn't already guessed). from that day when starting engines, he points at the number "2", says "engine number 2", aloud and then grds it! There's no rushing required in this job, just nice slow, methodical actions, and you'll be ok. I bet you won't do it again though, and better on the ground than in the air!
