Know the difference between when you’re being realistic and when you’re dreaming (trying to make fantasy a reality).
A general rule of thumb: if you think something (especially something you’ve never done before) is going to be 1) easy, or 2) a sure thing (whether easy or not), you’re probably dreaming.
That doesn’t mean it can’t be done, but it probably won’t be. You might start the process, but you likely won’t succeed.
The idea of making our dreams a reality, is actually a lottery. For a small number of people, it will work out (though not entirely, because we tend to dream of things being perfect). For the vast majority of people, it won’t work out. If there are a million kids who dream of being the next Michael Jordan or Wayne Gretzky, the math is clear. It’s a Bell Curve.