How to upgrade hard disk and optical drive in Vaio NV170

Hi,
I got a vaio NV170 and it works ok but all of the sudden the Optical drive is not working. The sonny ppl would charge me a proce of almost a new Toshiba or dell with a good spec.
is there any body have the information on how could i replace the optical drive myself.
thanks you may also e-mail me at elbandrawy@gmail.com