The CyanogenMod team has released a beta version of their CyanogenMod ROM installer for OS X users. So the process of installing the ROM just got a whole lot easier. Yes, I know it wasn't complicated for many but this will ease the pain for some.
You can join the CyanogenMod Installer Mac Beta Google+ Community and download the app and if you have any problems you can post in there too.
The download link is also available here.
You can find a full list of supported devices here on the CyanogenMod Installer Wiki page.
If you are new to flashing Android devices then the community is a good place to start asking questions. But with this installer all the work should be done for you. Also the Wiki link has a lot of FAQs for you to read through.
Using this installer competely wipes your SDCard so if you have any files on there you must be sure to backup everything you have on there that is improtan to you.