It’s vital to choose your tense before starting to write. Whether you choose first person or third person, it’s a painful process to changer you mind and have to rewrite an entire draft.

Revision is more than just changing pronouns from he/her to I or my. First person delves subtly deeper into your protagonist’s thoughts and feeling and interpretations of a situation.

Tonight, I rewrote one and a half scene adjusting for the shift from third person to first. I have a long way to go.