How do I replace the hard drive?

I got a message that my internal hard drive is failing, and I need to back up the data I can and replace it.
I'm running a 27' iMac and I can open any of the users except for the main one. The unit just freezes while booting, unless powered up in safe mode.
Is it possible to do this myself, or ... what options are open to me?
Thanks.

If you have never worked on a computer before and, especially, working inside Macs, in general, and iMacs, specifically, then this is NOT a DIY project for you to undertake.
The aluminum model iMacs are an excersize in patience and tedium to get at anything inside.
Take your Mac into either an Apple Store  or Apple Authorized repair service center and pay to  have them replace the hard drive.
Apple uses proprietary hard drives that have a special connection for temp sensors that control the iMac's internal fans.
Try and get a backup of your data before you bring this in for the hard drive replacement.
Good Luck!

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