eval {use AdminService qw (:all); };

use happens at compile time, not at run time . For that to work you would have to write

BEGIN {
eval { require AdminService; AdminService->import(':all');
}
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my $dir = getcwd; use lib $dir."/mysubdirectory";...

If cwd were what you wanted

use File::Spec;
use Cwd();
use lib File::Spec->catfile( Cwd::cwd(), 'mysubdirectory' );
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but cwd isn't what you want, you want

File::Spec->catfile( File::Basename::dirname( File::Spec->rel2abs(__FI
+LE__) ), 'mysubdirectory' )
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Regarding number 2, I could surely enter the path manually, but the software is supposed to work "out-of-the-box" in different configurations.

That is accomplished is by installing the module and program, like Pod::Perldoc and perldoc