That's pretty much it. I didn't need a college education to quickly get to a six figure salary. Be dependable, be positive and forget about the limits of your job description, learn and volunteer for everything that makes you more valuable and useful in the work place.
If you want a promotion, take on the responsibilities of the position you strive for. It will make you a no brainer for the position when it becomes available.
Excellent advice.
(And, when appropriate to the circumstances, always dress for the position above yours ;-)
Also, take on the projects and tasks that nobody else will do.