Things to keep in mind before you buy or lease a car: Inspect the car carefully. Always test drive the car. Have a trusted mechanic inspect any used car. Check the history of any used car and ask to see the title. Things to keep in mind when negotiating the best deal: Negotiate the price of the car first. Discuss trade-in value after you have agreed on the price for your new car. Do not negotiate based on the monthly payment amount. Review extended service contracts or warranties to determine coverage restrictions and limitations. Read and understand the purchase or lease agreement. Do not sign anything with blank spaces. Put everything that you and the seller agree to in writing. Do not take physical delivery of the car until all paperwork and financing have been finalized.