What exactly does that mean - "you can do anything you put your mind to"? Is it just something parents try to teach their children to get them to learn confidence and problem solve? Does it mean I can become a pitcher in the major leagues and win a world series? At the age of 45 and having not pitched or thrown a baseball in quite some time - I would venture to say "no".
So, then what does the statement even mean - does it actually have any utility at all? In essence, the capabilities of our minds are seemingly endless. We have the ability to think of unimaginable inventions, brilliant ideas, thought provoking stories, captivating illustrations, works of art that put us in a trance, breath taking architecture, emotion evoking music, and the list goes on and on and on.
When we take the time to think - to allow our mind to take us on an adventure and write down our ideas, sketches, thoughts, stories, etc. - that process can lead us to doing things we might not have thought to be possible. Apply the principles of daily practice (i.e. if you want to be good at anything in life, you have to practice) and see where it leads you. You might not end up where you thought you would when you first started, but you will likely be much further toward something amazing than you would had you not followed through with your idea to begin with.
Ultimately, we don't truly know what we are capable of doing if all we do is watch other people run with their ideas, fulfill their potential, practice daily on improving on their craft, and live life the way it was meant to be lived.
Two simple thoughts on getting moving toward your big ideas:
1) Spend time working through the crazy ideas and thoughts that come to you when they pop in your mind (and write them down/record them at the very moment they occur)
2) Take ACTION or follow through with the ideas to see where they will take you...imagine if Henry Ford, Jeff Bezos, or Elon Musk just left their crazy ideas alone and never wrote them down or took any action.
Can you do anything you put your mind to? Think about it and then do something with the thought