Good point by K'n C about mistakes. The person that never made one never made anything. Another point worth mentioning is personal discipline in seeing tasks through even though they're uncomfortable and difficult. For example, you're going to come across landing gear lubrication points that won't accept grease. They're often awkward to get to and there's always the temptation to leave them for the next scheduled check. Maybe a mechanic has overlooked them on a previous check and your diligence could prevent a component hang-up. Little things can matter a great deal in aviation. You'll hear a few crew-room stories about that.