For a while now CPANPLUS has shipped with a very cool feature called cpanp-boxed
cpanp-boxed will let an individual use CPANPLUS from it's distribution directory without having to install it or to use CPANPLUS to boot-strap install itself and it's dependencies.
I think this is rather groovey
$ wget http://www.cpan.org/authors/id/K/KA/KANE/CPANPLUS-0.84.tar.gz
$ tar zxf CPANPLUS-0.84.tar.gz && rm CPANPLUS-0.84.tar.gz && cd CPANPLUS-0.84/
$ perl bin/cpanp-boxed
CPANPLUS::Shell::Default -- CPAN exploration and module installation (v0.84)
*** Please report bugs to <email@example.com>.
*** Using CPANPLUS::Backend v0.84. ReadLine support disabled.
*** Type 'p' now to show start up log
Did you know...
Many operations take options, like '--verbose', '--force' or '--skiptest'
CPAN Terminal> s conf cpantest 1; s conf email firstname.lastname@example.org
CPAN Terminal> i YAML::Tiny; i Test::Reporter; s selfupdate dependencies; i CPANPLUS
And there you have it, cpanp-boxed will boot-strap install all it's dependencies and itself and submit CPAN Test reports as it goes along.
Of course, you can just use cpanp-boxed as is to install any module you want without having to install it.