How to change from nginx to apache2?

[tstivers]

I have set a server up following this guide:

http://www.howtoforge.com/perfect-se...nx-ispconfig-3

I have now realized that nginx will not work for my needs, and need to change the server to Apache2. I have already added and configured all of the websites on the server (around 120 of them) and am in the last stages of setup, now realizing I can't use nginx. How would I go about changing the server to Apache2 while hopefully keeping all of the sites that I configured on the server intact with minimal pain in the process of changing it over?

I am using the latest version of Debian, with all updates, and the latest version of ISPConfig. I followed that guide to the letter with no changes at all except for the hostname etc of course.