I realize I am a novice at automechanics, but can someone tell me how to change an air filter on a 2002 Trailblazer, 6 cylinder?

Dead simple, just did it a few weeks ago when I had it open to get to the passenger side headlight bulb. (access to the light is next to impossible without removing the air filter cover).

There's a couple of Philips head screws (the little star shaped ones) that hold the plastic cover down. Three in total, I think, unscrew them, pop the cover off, pull the old filter off the intake hose, slide the new one on, replace the cover, replace the screws. no problem