Humility is probably the most difficult virtue to realize.
Two definitions of humility are; one, being aware of one's own defects of character, and two, giving credit where credit is due.
This means if you do something and are successful because God gave you certain talents, give credit to God when someone tells you how well you did; this is being humble.
If you are successful at something, but had help from friends, spouse, neighbors, give credit to those who helped you; this is being humble.
If you have done a task and you alone accomplished it, give credit to yourself; this is being humble.
Say the truth and give credit where credit is due.