Career 1: trading floor secretary. Turned up early, kept smiling, took a keen interest, noticed an occasional error on the book and diplomatically dealt with it. Promoted to syndicate desk, ran the syndicate desk, moved onto the floor. Managed up. 16 years
Career 2: HR went back part-time when the children were both at school after a break. Started at the very bottom - £8.5k. Turned up early, kept smiling, took a keen interest, caught a few plates. Promoted two grades, went full-time (no impact on earnings due to tax and childcare). Kept catching plates and delivering a good service. They sponsored my CIPD qual, Promoted to Adviser then Snr Adviser. Couldn't go further so moved sideways to a similar sector. Managed up. 9 years
Used the same formula, caught the plates, worked hard, Managed up. Promoted to Deputy Director and Head of Service. Now Director of two services. 11 years
The common themes: be early, be reliable, be pleasant, work hard, catch the balls without dropping people in it, keep your own counsel, show an interest, be prepared to deliver at the grade above consistently, be quietly confident.