2003 - is it 2000 to 2003 model or 2003 on? Eitherway not too difficult to do though rather to difficult to explain here, suggest getting a Haynes manual.
Whatever you do disconnect the battery in case you trigger the airbags and before you do that makesure you have the radio code.
If 50% of bulbs gone it may be a wiring issue not bulbs gone.