Exchanging the internal Harddrive of an iMac 20"

Has anybody ever exchanged the internal Harddrive of an intel based iMac 20"? I would like to replace the internal 250GB by a 500GB. I have heard it would be rather simple with an 24" iMac and more sophisticated with an 20" and 17" iMac.
Can anybody help on that issue? Any tips or experiences?
I do not care about any loss of warranty and I am quite familiar with working with hardware.
Thx for your help!

Hello Thomas
Have a look at this:
http://www.baconeggs.co.uk/images/dmm/iMacEarly_200620.pdf
Be patient it takes a bit to load, save or print it after you get it open.
Dennis
17" iMac Intel Core Duo - 1.5GB Ram -   Mac OS X (10.4.9)   - Maxtor 300GB FireWire - Creative Inspire 2.1 - 2G Nano

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