I did it from here through the Port Of Seattle. The car went to Sweden ('04 Cobra Mustang). Getting it in a container is easy. There are many brokers who will help take care of the paperwork. The hard part was on the other end, waiting for it to clear customs and then the tax bill. If you sell it to Hawaii you may want to use a broker that can ship to the west coast by rail then on to the boat for the rest of the trip. I mention this because the added expense of going through the Panama Canal is HUGE and it will add about two weeks to the trip.
It can all be done and is not too hard. Just make sure you look at all options.