If you want a version which doesn't require using the terminal at all, you're pretty much out of luck unless someone wants to write some form of application to help out.
But, I have figured out how to do things with less unix knowledge. It is possible to launch a version of TextEdit which can edit protected files so that you no longer need to use a unix editor such as vi or emacs. To do this, you open a terminal window (launch Terminal from Applications:Utilities:Terminal) and type "sudo /Applications/TextEdit.app/Contents/MacOS/TextEdit" and press enter. This will give you a TextEdit which you can use to create or edit the /etc/ppp/options file (or any other file in your system at all, including ones which should not be changed, so be careful).
Using UUCP/cu will requires installing the developer's tools and will likely still need a little unix knowledge to get installed. Which is a shame because it's more straightforward than minicom to use. But if you want no unix knowledge, then go with Minicom.
Minicom can be installed without the developer's tools by installing Fink. Fink can be installed by using the installer which can be downloaded from http://fink.sourceforge.net/
and then using Fink Commander, which is included in the install. Fink Commander is a fairly friendly GUI. Follow the instructions from the web page to get it all set up and then use it to install the binary form of minicom. Then follow the rest of the minicom instructions. Minicom is a program which runs in the terminal, but it is very easy to use, no unix knowledge is required. I had never seen it prior to this and had no trouble.
I'll try and get a more complete no-unix version of the guide written up at some point, but it really doesn't require very much unix knowledge, so you should give it a try. If you have problems, let me know.