There ain't no 2003 Pontiac Firbird repair manuals available yet. What happened to your owner manual? If you own a 2003 Firbird you can afford to go get the oil changed at Quik Copy. Make sure you watch and learn where the plug and filter is located. It's a cheap learning lesson. There's no such thing as a 2003 Firebird! They were last made in 2002. As for the location of the drain plug and filter, you can probably find it in an online manual. Just do a web search for 2002 Pontiac Firebird Owner's Manual. If it's not in there, join a Firebird discussion group/message board like Firebird Nation or something.