Originally Posted by Division

If you start doing audio installs 'semi-professionally' be very careful if you're not going to carry insurance. I had a good friend of mine that made one mistake (drilled into a master cylinder while punching through a firewall) that took his situation from bad to very worse. It may be in your best interest to try to get into an installer position at a best buy or local audio shop where the extra details (insurance, taxes, etc) are all taken care of for you.