I knew I wanted to work in a very competitive industry. I'm not from a wealthy background, so I had to think about the best way to do that.
It meant studying hard to get into a good university, and then studying hard when I was there. I had to work evenings and weekends to fund that, so I didn't have loads of time going out and partying, but it was worth it to come out with a good degree.
I then took out a loan to do a postgrad qualification, and worked super-hard at that, as well as working evenings and weekends to pay rent etc.
While I was studying we had to get placements in industry, so I applied somewhere I wanted to work. Once through the door, I worked flat out for them (for free), while also working evenings and weekends. I kept in tough with them throughout my course, asking to go back whenever they'd let me, covering for people who were sick and on holiday, working there (unpaid) through the summer.
I made myself indispensable, so when an entry-level job came up, I got it.
I then worked flat out for them until I got what I wanted. It took years of 70 hour weeks (being paid for 40), volunteering for things, building my experience and contacts.
I left and set up my own consultancy after 15 years and I'm now able to have a better work/life balance. It came at a cost - I put off getting married and having a family so late we needed IVF. I've missed events, holidays and more parties than I can count, but for me, it has been worth it.