I am thinking of buying the base 27 inch iMac and upgrading the hard drive myself. I read few threads here of people doing it but I am concerned about breaking the glass while lifting it off. I am somewhat handy having replaced the hard drive several times on my white iMac which is no picnic. Any thoughts on this from people who have taken off the glass on the new mac or even the older 24 inch display glass? Thx.