Microspeak: getting down to the nitty-gritty
drill down
To delve deeply into the core of an issue, rather than deal with it in a superficial manner; to analyze the details.
granular
Generally, and rather peculiarly, used in tandem with the verb "to get," as in "We need to get granular on this issue," meaning to examine the fine details. To get granular one needs, it goes without saying, to drill down.

© Ken Barnes

Klugey code - or worse, dogfood - is probably what you end up with if you don't get sufficiently granular...