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Get the list of your installed 5.8 modules:

perl -MExtUtils::Installed -e'print join("\n", new ExtUtils::Installed->modules)' > module.list

then install Perl 5.10:

tar xzf perl-5.10.0.tar.gz
cd perl-5.10.0
sh Configure -de -Dprefix=/opt/perl -Duserelocatableinc
make && make test
sudo make install
/opt/perl/bin/perl -e 'use feature qw(say); say "hi"'

and then re-install your modules with cpan `cat module.list`.