I found this article for general guidance on upgrade/migration to Pega 7. This contains access to documentation regarding upgrade/migration to Pega 7.https://pdn.pega.com/forums/pega-upgrade-center . You may post your question on the section as well.
However, I would greatly appreciate if other community members to share any tips/suggestions based on your experiences that might help Laura out.
Vidyaranjan A V | Online Community Moderator | Pegasystems Inc.