blending the paint isnt just easy as reading a book or manual. its quite hard. i'm going to school to do it right now.
but it wont be real cheap. but try checking any schools do auto body work in your area they will usually do it for just the price of materials which is alot cheaper.
my school does the same thing, they'll paint a whole car just one part for the price of the paint,primer,clear coat, etc. it may take a little longer doing it this way but you can save alot of money.