Few questions:

Uno ~ If I bought my car from a dealer, then modified the engine, etc elsewhere, would the dealer's service department still service my car; and would they still accept my warranty on factory parts?

Dos ~ What sites offer some good pictures of exterior mods on Civics?

Tres ~ When (If) I mod my car, should I learn how to do it myself (are most mods that simple?) or should I pay the extra to get it done professionally?