There are two resources that will help.
Migration
Move applications
The readiness script gives you a very good idea ot what can be moved.
You are essentially changing IDP so that affects endpoints, id's, certificates etc.
Best way is to swap applications over based on the script one at a time.
Disable the ADFS entry - don't delete it until 100% sure.
Use the ADFS
restore tool to backup everything first.