Do you remember if the homes were mostly in town?
Also will parking be an issue?
Depending on what you mean by "in town," yes. Mostly in the older part of Manteo around the business section and to the west of it.
A fair number of people went on the tour, so parking (on street, of course) could require you to park away from the house. There were some houses close enough together that you could park at one and walk to another. But the distance was never very far.
The best plan might be so come early and start in the middle of the list of homes. Or come toward the end of the day when the people coming to look will drop off some.