It depends a lot on exactly what you want to move.
Users/Groups associated with the data
Current state or full history
Configurations
Do you have apps in your instances that add functionality or manage data? Will those apps be in the destination instances?
In Jira - Filters, Dashboards, Plans
Is the destination environment going to have the same or higher subscription plan for each product?
If you have concerns about being in over your head you might consider recommending engagement of an Atlassian Solution Partner that has a specialization in migrations.
Disclosure: I work for Praecipio, an Atlassian Platinum Solution Partner, and we do have a specialization in migrations. You can look for Partners in your area and filter on specializations in the Atlassian Partner Directory.
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