...installation of Daytime running? I have a 2005 Audi A4. This is an American car. What's involved in installing daytime running lights.Is it something that I can do myself?

I wouldn't try to do it myself. If you mess up anything in the electrical it is expensive to have fixed. If it was a 1985 K-Car, it might be different, but there is a lot that can be damaged by an accidental short, or any temporary crossed circuit. A dealer or any shop with an auto electrical specialist can enable DRLs for you pretty quickly.