Find a metaphor related to your specific situation, one that will have a particular resonance with characteristics about yourself you want to emphasize. Decide what you would like to say and look for metaphors with good parallels.
Break down the potentially-applicable metaphor. Metaphors are pieces of figurative language used by writers to make comparisons between two objects or ideas. For instance, "the sea is a hungry dog" implies that the ocean is insatiable, irritated, and quick to snap--all qualities of hungry dogs. Distinguish what the comparison is and how you might be able to apply it to yourself.
Synthesize the compared object or idea with what you'd like to say about yourself. Understanding metaphors usually requires going backward from the metaphor itself to the parallel in your personal predicament. With the qualities of the metaphor broken down into more characteristic and general terms, describe how those same qualities apply to your own person or situation.
For instance, if you were to compare yourself to a "roaring lion," you would delineate how ferociousness, bravery, and leadership skills--typified by roaring lions--apply to you.