Recruiting is a lot diferent than DII/DIII, with many more battles. One of the tricks, especially at low DI, is gaining an appreciation for which battles are winnable and which aren't (or, even if they're technically winnable, are they worth fighting).
You need to make sure you properly understand and evaluate the major factors that go into that -- prestige, distance and available cash (both total available and how that # is effected by other battles you or the other coach are in). You also need to be mindful of things like being poached by higher prestige programs, not overextending yourself, etc.
To me, mastering recruiting is by far the biggest difference between DI and the lower divisions.