You've gotten answers to all of these in the chatterbox just now. Please pay attention.

To find out what you've got installed, use ExtUtils::Installed.

To install things in your personal directory, read perlman:perlmodinstall.

To find out where things are installed, use perl -V which will tell you among other things what the @INC path is.

-- Randal L. Schwartz, Perl hacker