TheNAUGHTicalLifeFeatured By OwnerDec 11, 2012Professional Writer
If you kept it in constant third-person you would have to keep in mind where on the timeline you need them to occur and work it in when the protagonist learns them, if said events are important to the story. I think splitting the novel in two sections and layering them would be interesting.
Having the book change from 3rd to first can be really confusing, I did something like that with mine and it started to confuse me think about how the readers would have felt. Having all the book in first person sounds like the better and you can add more description because of the characters looks and personality. I hope I helped.