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wget http://launchpad.net/plone/3.1/3.1.4/+download/Plone-3.1.4-UnifiedInstaller.tgz
tar -zxf Plone-3.1.4-UnifiedInstaller.tgz
cd Plone-3.1.4-UnifiedInstaller
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Find the README.txt for more information. You can install Plone as standallone (server wide) or for a user.
Here we are dealing with stand alone or serverwide installation.

Make sure that you have gcc and g++ installed.
Else install it using yum of up2date.

====Optional====
yum install gcc
yum install gcc-c++.i386
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You can list the available packages using the command

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yum list | grep gcc
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Once you have both gcc and g++ its easy.

run as root

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./install.sh standalone
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This will install plone in /opt/Plone-3.1/
You can start plone using the command

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/opt/Plone-3.1/zinstance/bin/instance start
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Access your zope settings at http://serverIP:8080/zope
Access you  Plone at http://serverIP:8080/Plone

The login will be given at the end of installation. Alternatively you can find it at /opt/Plone-3.1/zinstance/adminPassword.txt

(To change your password go to http://serverIP:8080/acl_users/users/manage_users   click the “Password” link for the admin)
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To get information about changing port and other setting, open the file /opt/Plone-3.1/zinstance/README.txt

Thats all