Try with unlockroot.com
You can't do anything wrong with this tool.
Rooting phone basically copies two files to system partition. "su" to "/system/bin/" and "Superuser.apk" to "/system/app". "su" is app which other apps use to gain root access, like on linux and "Superuser.apk" is app that manages which app is allowed root permissions and which not.
Root enables you to change system variables to speed up phone, or for example recover wifi passwords with Wifi Key Recovery, delete bloatware apps from your phone with Titanium Backup (or backup and restore apps), increase space for apps by linking app files to second partition on sd card with Link2SD, patch apps with "Lucky Patcher" to remove ads from free play store apps, disable startup on boot of unwanted apps with "StartUp Manager".
The most important thing V6_SuperCharger script does, it changes minfree values and rearranges application and service priorities.
For minfree values you can also use "AutoKiller Memory Optimizer", because changing app priorities on ICS requires patching "services.odex" file and can make your phone boot loop if you do something wrong, but if you do it by tutorial it works. You can always restore your phone with PC Software.
Don't be afraid of boot loop because it does not damage your phone, stock odexed roms recognize that services.odex has wrong signature or is not patched right and phone won't boot. It's the same like deleting ntldr file on windows, and then windows won't boot. You can repair your phone with PC software which installs phone software again and phone will work.
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