Gonna try this in a few days iyh, hope it goes well. 
So i did it this way. Just a quick review for anyone else who might wanna do it. Do not do this if ur shlepping lots of luggage or even any, it will be a major shlep. I took the 3 subway to Park place, from there you walk 3 blocks to the path train, passing by the magnificent OWTC along the way. Take the path train to newark, which is the last stop on the line. From there i went to the on-site hilton hotel and requested a shuttle to the airport, but was told that the next one was in a few hours. So i walked across the street to the NJT bus terminal in penn station, where you jump onto bus #62, which goes to all the terminals of the airport.
Total cost was $6.25 ($2.50 subway, $2.25 path, $1.50 NJT) Total travel time was approx 1hr and 50min. Would do it again if i have time, if not would pay extra to go on NJT to 34th street.
