Is there an easy way to root access on a Linux netbook?

I recently bought an Acer Aspire One and have been trying to get my 3 mobile broadband modem to work with it.

The dongle (ZTE MF622) is seen as a mass-storage device. I've surfed the web and found a solution:

http://hillj.co.uk/2008/01/31/how-to-get-online-with-three-mobile-uk-and-linux-ubuntu/

However, I can't get over a few basic problems.

I need to be able to create a new file in the /etc/udev/rules.d/ directory, but when I try to do this it comes back with the error "Can't open file to write".

I'm pretty sure that this is something to do with not having root priviliges. However, I have no clue as to how to set this up.

Any help greatly appreciated. ®

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