That's a great use of secondary research to help define the design. The next step is to do some usability testing with your real users, to check your assumptions and discover any issues not covered by the secondary research.
There are some useful recommendations here: http://uxmastery.com/tag/usability-testing/
The first step is to work out what you want to test, and how you'll do that. So, you're wanting to test the navigation flow via a usability test, but you'll need to work out exactly what that will look like—session protocol/script, questions to ask or tasks to set, etc.