Adding Backstory

Since I took time off from all extraneous pursuits a month or so ago I've not only been getting my head together, I've found time to do some of that reading.
(That's part of getting my head back together.)
It's been TBR-bookshelf time.
A self-indulgent immersion in story.

I'm looking at how to fold in complicated backstory in First Person.  Ben Aaronovitch Rivers of London,  Jim Butcher's Storm Front, and Seanan McGuire's Rosemary and Rue  

Backstory be like (1) lay out the backstory on the bones of the plot, (2) take your time. 

I'm mentally highlighting my way through the books in three or four different colors and see how they're woven together.

Interesting that the three authors who immediately come to mind for introduction of backstory are all writing First Person.

Do we introduce backstory and infodumps more easily in First Person?
More to think about.