First, it appears I've done it! On Tomcat, no less. If you have the Tomcat instructions from developer.apple.com and the MM instructions for CFMX, you can get there from here. Being a rather new-to-unix person I took a LOT for granted. Below are some lessons learned.
Things you need to know:
1. gnutar: You must use this to untar the Tomcat .tar.gz file. (Initially, I renamed the file, dropping the .gz, and used the standard tar command. Bad.)
2. If you're reinstalling after a failed first (or 2nd or 3rd... ) attempt of ColdFusion, DON'T reuse earlier files. Do a clean install. I tried taking shortcuts and only got errors sooner.
3. DON'T BLOCK POP-UPS!!! I'm using Safari and at first use I went to Safari Menu > Block Pop-Up. When you first go to the CF admin page, YOU GET A POP-UP. Unless pop-ups are blocked.
Now... I just need to find about about getting a serial number for Mac...