Usability Testing – Biased Scenarios

I'm looking for some advice on how to handle testing when a scenario involves a user needing to choose a specific location (City) in order to find content to complete a task. Content for the site being tested is geo-gated, forcing the user to choose their location prior to viewing content. Content is very specific to each location.

If I were to provide the location to the user as part of the scenario, the task would be fairly easy to complete. If I do not provide location information as part of the scenario the user will most likely fail the task.

Both options bias the results in one way or another. Tests will be unmoderated, so I won't be able to provide any coaching along the way if a user gets stuck. Is there a good way to word a scenario to avoid skewing results in a case like this?