It's not that hard to play the Jacks when you have a good read on your opponents.It depends also if you are playing cash or tournament.And It is a tournamet , its really more hard to play them , but you have to know that they are just a pair as 44,55 ,66 .. For example
lets suppose that your opponent raise from midle position in a tournaemnt in the mid game you 3bet him , and now he is 4 betting you.What should you do?Did he really 4bets with hand weaker then JJ ,is he bluffing or makeing a value 4 bet ? To answer this questions , you really need to have some good reads on your opponents