Tell me what choices you make throughout the day, and I'll tell you whether you're likely to reach your goals.
Your actions reveal your priorities.
In the end, no matter what you say (or even how you feel) about what you want to accomplish, what you choose to prioritize will ultimately be what determines your success.
At the extreme end, if you set out to make the CrossFit Games as a beginning CrossFitter, unless you're willing to dedicate several years of training 5+ days per week, 50+ weeks per year, essentially willing to prioritize training ahead of nearly everything else in your life, you may want to reconsider setting that goal.
In the same way, if you find yourself wanting to look like the CrossFit Games competitors on ESPN, you may want to take the extra step to consider how much work they've put into looking that way. Both in terms of consistent (maybe even constant) attention to food intake, and constant either training or recovery, they are dedicated to the extreme. Wanting to look like that, without wanting to eat or train like that, is essentially an exercise in futility.
As you set body composition goals, think not only in terms of what you'll gain, but also what you'll lose. It's easy to say you want to be lean, but hard to commit to eating ice cream less than once a month. It's easy to say you want a six pack, but can be quite hard to plan ahead and eat protein at every single meal. It's easy to want a muscular physique, but hard to get the consistent sleep required to support recovery.
That's not at all to say you can't set difficult or lofty goals. If you really want something, go out and grab it. Just make sure that you want whatever it is enough to accept the corresponding sacrifices that will be required. If it's really something you want, and something that you're willing to prioritize, you'll likely enjoy reaping the reward enough that it's worth the sacrifice. Just make sure to have that conversation with yourself. In this case, to paraphrase Art Williams, I can't tell you it will be easy, but I can tell you it will be worth it.