I know that this is said 1000 times a day on this forum, but you've got to pull the trigger at some point.
Is planning good? Of course.
Is dreaming big a great thing to do? Yeah.
But you have to remember that giants like Google, Facebook, Microsoft, etc. didn't get there just by dreaming big.
They would dream a little, make it happen, then dream bigger from there.
Stand on the shoulders of giants- your own giants! In other words, get some success under your belt, then you'll be more likely to reach that bigger dream.