That was very inspirational. It is true, you would be amazed what you can accomplish if you truly believe in yourself and truly do what you have to do to accomp[lish your goal...and then don't stop there, keep on believing and keep on going, one step at a time. Yes there will be many small failures and many small victories but if you truly believe and truly do what you must, success is inevitable.
The only limitation is that the goal must be physically possible, flying like a bird unassisted is not a reasonable goal.