Not a problem. If you are just starting out I would recommend the following points to work on:

• Refresh on what Bullet said earlier about always finishing your model before playing around with textures, skipping out steps is the downfall of a lot of people.
• Research the various techniques for builing cars, my personal favorite is, mapping out Nurbs curves, lofting the panels then converting them to a low poly mesh. This way you have a quality edge flow but your panels are different pieces of geometry (as car panels are in reality).
• after you are happy with your model, prepare your UV's, extremely important if you intent on adding additional specific detail such as rust, stickers, and mud etc

I may well start from scratch over the next week and put a tutorial together for a shader network dealing with car panel rust, its something I've not really looked into before. If you haven't solved your issue by then i'll post it here for you.