So you remember Solomon? How He prayed for wisdom and became a very wise man?
Well guess what? I've been praying for humility. Have I become a really humble person? Not by a long shot. However, after much prayer and a change of heart, God has taught me a lot about humility.
I've learned that it's less about how much you think of things and rather more about seeing things through God's eyes instead of your own. This changes things in your life, when you view them from a whole other perspective--not just simply the "less about you" that everyone talks about.
Praying for certain qualities--this is one aspect of prayer that people forget about, it sounds too good to be true. And selfish sometimes. However, if humility will enable you to do God's work more, why would He keep it from you? We know that God works for the good of those who love Him, and if you ask anything according to His will you will receive. Don't get me wrong--this is no prosperity gospel for you. God is the one who judges and knows hearts. He is the one who gives and takes away.
Therefore I encourage you to pray with a right and true heart about who you are striving to become--someone who looks more like Jesus. Don't underestimate the one who changes and works for you.
There is nothing about exalting God that should ever exalt us.