Advice for Removing Institution's data from a Multi-Institutions Campus Solutions Environment

Our college originally implemented PeopleSoft with two other technical colleges. Those two other schools have since migrated to other SIS applications. We are embarking on a project to delete the course/class data, student data and all other set up data for these two other institutions. We have a strategy for how to accomplish this, but I was wondering if there were members from other institutions that had gone through a similar project who might have advice about gotchas to watch out for, recommendations for testing, or any other learned experiences to share with us.

Thank you in advance,

Arden Rice