Traveling between Narita & Haneda Airports

We arrive at Narita Airport at 7pm and have to get to Haneda Airport for a 1:30am flight to Saigon, Vietnam. What's the best way to get to Haneda from Narita in terms of ease of travel with suitcases, dependability to get there in time and cost?  

The easiest way, if you’re carrying a lot of luggage, and don’t know Tokyo trains, is point to point on the limousine bus. https://www.limousinebus.co.jp/en/areas/detail/hnd/narita  Book it 2 days in advance.