Hi there,
Not sure which of the CI6.6 products you currently have - and that will significantly influence the approach, effort needed and duration of an upgrade.
My advice would be to reach out to your local SAS Professional Services team to work with you to assess the current environment and put together an upgrade project with you. It may be your organisation can do a significant proportion of the work; alternatively you may benefit from the Professional Services team being heavily involved, It will all depend on your particular scenario.
One good activity to start whilst you engage your local PS team... start review the current campaigns and associated objects (export definitions; campaign definitions etc) to identify any campaigns or objects that are no longer active. The less old, and unused, content you migrate the easier and cleaner it will be
Hope that helps
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