Increase storage Macbook pro late 2008

[Tolly]

Hello
I am hoping somebody could help.

I would like to increase the storage from 250GB to 1TB, hopefully without effecting my existing files on my mac.

These are my mac specs:

MacBook Pro
15-inch, Late 2008
Processor 2.4 GHz Intel Core 2 Duo
Memory 8 GB 1067 MHz DDR3
Graphics NVIDIA GeForce 9400M 256 MB
Software Mac OS X Lion 10.7.4 (11E53)

I have purchases this:
Samsung Spinpoint M8 1TB 2.5 inch SATA II 8MB 9.5mm Hard Drive For Apple Mac Book, Mac Book Pro, Apple Mini PS3

I am very confussed as to which area I am to add this to.. and do I need some kind of Caddy?

Any clever person who can point me in the righ direction would be much appreciated.

Kind Regards

 

[Kaveman]

This is not a user serviceable part. This is a very fiddly thing, one mistake and your Laptop could be toast.

Why not just have an addition External Drive?