Can I change/add RAM in an alienware laptop?

Well, I am waiting for my Alienware m15x, and I was thinking of add some memory.

I think of buying 2 Dimms :

http://www.amazon.co.uk/exec/obidos/ASIN/B000Q76LBY/ref=ord_cart_shr?%5Fencoding=UTF8&m=A2UD95CFO7TBZQ

Can I change the memory by my self?

Does anyone knows whether this machine has a 32 or a 64 version of vista? cause I can't find anything...

Well, if you opened alaptop before then you shouldnt face any problem, otherwise let some expert do it for you because im sure, you dont like to spoil your laptop.
Also, you were saying that you are ''Waiting'' so if you just order it, how you are going to open it, are you willing to void your warranty ??SearchMaster

Well, hell no. I thought there was a simple slot or something...

It's really simple if you know what you're doing.

Unscrew the panel that shields the RAM. Press the two lever things that hold each DIMM in, away from each other. The DIMM should raise up at an angle and then you just pull it out.

It will look like this: