While describing the issue is helpful, including details about why you’re having difficulty is equally as important.
Is there some code that’s not working? What’s preventing that process? What’s your coding environment, and version of XCode, Realm, Cocoapods?
Are you getting an error?
Also, the question is a bit broad - is the issue removing Realm or how to migrate data? You should migrate your data first and then remove Realm if that’s the case but please keep questions to one question per post so we can focus our attention on in.