Advice for coastal trip.. Newport to New Jersey
It is always hard to give you a real answer because it is hard to assess another person''s ability from a post on the Internet. You did not say where the boat is now and where you are going with her. There is obviously a huge difference between going between Rhode Island to Sandy Hook vs going from Annapolis to Sandy Hook for example.
I think the best clue here is your own concern. I would suggest that you try to find a more person with more offshore experience than you have and see if they want to join you on the trip. You might consider hiring a knowlegeable delivery skipper to come along with you so that you have a back up. You will need to explain you objectives to the delivery skipper in advance. I suggest that your objectives are 1. getting the boat delivered safely, 2. Getting some offshore experience because cruising in New Jersey means a fair amount of time offshore, and 3. Learn something about what you don''t know so that you can know what you need to study. Some delivery skippers may not be willing to do this or are not suited to this kind of thing but most are used to have owners on board.
One thing that concerns me is that you seem to see this as a long motoring trip. Does this mean that the boat is not is shape to be sailed? I would not want to do a trip that is that long and depend on motoring the whole way in an unfamiliar boat.