Tickling the throttle open - bad habit
Another gotcha to watch for is the habit of some pilots ticking the throttle open slightly to help the start. We now teach that this is not an acceptable technique following the experience of an examiner doing a type rating test on a R44 Raven II. Examiner had checked throttle was closed prior to start then removed hands from controls for flight as required in that role.
Student had gradually tickled throttle open further and further whilst cranking because the engine hadn't started, then he suddenly realised that he hadn't pushed the mixture in, so did so. Result overspeed and fastest type rating test failure ever - within 2 secs of engine.