How does a person practically rid himself of the 'ujb (self-admiration/vanity) that afflicts him after performing acts of obedience or good deeds?

Conceit is a dangerous affliction caused by ignorance or heedlessness. It can lead to ruin if combined with people's praise and a lack of piety. To get rid of it, one must reflect on their faults and shortcomings in every aspect of their life, compare themselves to those who are better than them, and know that any virtues they possess are a gift from God, necessitating gratitude and humility. They should also remember the transient nature of their blessings and the perishability of their body.