There is no "fool proof" method, there is always some risk with installing an operating system.
You can mitigate the risk by:
1. Back up your data.
2. Read the documentation before you start. Understand what you are doing.
Linux uses different terminology to refer to partitions then Windows.
See: http://ubuntuforums.org/showthread.php?t=282018
Personally, I fire up a live CD and run gparted -> do the physical partitioning -> then run the installer.
http://gparted.sourceforge.net/documentation.php
https://help.ubuntu.com/community/GraphicalInstall
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