From my point of view, you need to be aware that something worthwhile is not easy to achieve so you are supposed to be hardworking and disciplined. And sometimes, you'd want to give up because it's difficult but you need to encourage you by yourself.

Determination and drive to reach your goal. If you work regularly towards your goal and not procrastinate then you can probably achieve it! 

You can achieve basically almost anything you want... But of course, there will always be a corresponding price to pay(time, effort, hardwork or something else). Goodluck!

You need to work hard for it and believe in yourself.