'A' is a great letter and Ability is a great word to start with ! The word epitomizes all that's possible and indicates the some times latent potential that's locked up in all of us.
Just the way it took a long time for me to realize and actually start writing perhaps (?) meaningful to express some random thoughts, it does take a long time to believe in your ability and some times others' prodding works as well.
A seed does not know that it can grow into a big tree, Bill Gates wasn't born rich and even Hanuman didn't believe he could fly across to Lanka ! All of them neeeded to believe in their ability in a way and then worked diligently toward their goals at their various points of life.
So...Do Believe In Your ABILITY and just.....DO IT !!!