I read h(er|is) sentence as "contrarily to plain students, I've some limited space to manage by myself on the server...".

In addition to your suggestion, I'd say that if these scripts will be used also by other accounts on the server, the OP should:

• grant proper read access to the lib directory, and
• put a use lib "/path/to/home/lib";

to be sure that the inclusion can happen even if the other account hasn't the environment variables set.