another noob question

hey just another noob question...im trying to make my car look like its dropped 2"...i tried to layer just the body of my car and drop it but i can never get my body perfectly circled...so when i move it...leaves pieces behind...anyone help me with that...by the way im using photoshop v6.01

Make another layer with the whole pic, then on the second layer, trace along the bottom of the car and around the top of the pic with the polygonal lasso tool. The just move it down. Dont forget to crop the top though.

Hope that helps!