The Jags are very confident. One player was quoted as saying something to the effect of "if we go in there and win", meaning they think they can win. But let's not forget that they play in Flordia, and the cold New England weather will certainly be a factor, as it was with Miami last Sunday.
Also, Belichick's always had a good scheme for opposing young quarterbacks. I don't think this will be any different here. Wheter or not New England can cover the 7 rests on one question: "How badly do the Pats want this game?"