How does one do a Safe Boot?

My Hard Disk is balky, seems to overheat?
Dumb question: How does one do a "Safe Boot"
If I need to reinstall OS-X, how do I do that? I have Snow Leopard Install DVD, but I have since upgraded to Mountain Lion.
Please excuse my low level of computer knowledge. Thanks

1. Restart with the Shift key held down.
2. Back up your data, restart with the Command and R keys held down, and run the Installer.
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