Dont play roulette with your pocket pairs. When ya get em I dont suggest overplaying preflop, as he said before dont marry your hand because it looks nice watch the flop turn river individually and play the hand out as you would any other. You should also always watch your position when playing them 77 UTG is going to get you into alot more trouble then the button, also watch what people are betting before you if the utg+2 just 3 raised your jj is likely even in jeopardy.

IMO to many people these days see pocket pairs and dump to much in the middle to early.