The most straightforward way I can think to install a module on OS X is with the CPAN module, i.e.,

perl -MCPAN -e shell # gets you to the interactive shell
...
install somekindamodule  #installs it for you
[download]

It really is a piece of cake, and I haven't had any trouble using it. I installed the LWP libraries (and their dependencies) and Net::SSLeay on my OS X box with no problems at all.

There's also some more information here.

Gary Blackburn
Trained Killer