mazda 3-5 suspension?

i am looking @ buying a mazda 3-5 (wagon). i am sure noone has gotten the chance to mess with the suspension yet, but i am assuming that it would be simular to the mazda protege' 5 wagon. WHAT ALL IS INVOLVED IN PUTTING ONE OF THESE ON AIR? I KNOW NOTHING ABOUT CARS, ONLY TRUCKS. DO YOU BAG A CAR LIKE YOU BAG A TRUCK? HOW HARD IS IT? HOW MUCH SHOULD I EXPECT TO PAY FOR PARTS/LABOR. I AM NOT ABANDONING TRUCKS (STILL GOT THE 67 CHEVY), BUT THE GAS MILEAGE ON THE TAHOE IS KILLING ME (12.2 MPG!).