how to install bluetooth

THIS BLUETOOTH INSTALLATION WAS DONE ON A 2003 330I WHICH WAS PREWIRED FOR BMW CELL PHONE.IT WAS COMPLETED IN 1 HOUR ON SEP 25TH 2008.I AM NOT A PROFESSIONAL OR ANYTHING LIKE THAT.I WENT TO THE STEALER AND THEY SAID I HAVE TO BRING IT TO THE STEALERSHIP FOR CODING.BULL SH*T.USED A 7TH...