After I finished school I went straight to uni full time. I had never worked until I was 19, but in the 3 years after getting my first job, I saved up $40,000.
To do it:
Worked 20+ hours per week during uni
Worked 40+ hours per week every holidats
Lived at home
Didn't waste money on alcohol/smoking
Then just after I finished uni, but before I started full time work, I borrowed another $40,000 and bought my car. (Didn't want to liquidate my investments). Currently paying $400 per week.