Why be nervous?
The Patriots beat the gung-ho Giants in week 17. They did so without two of their starting OLmen and still negated the league's sack leaders. Every analyst agrees that the Giants' D must pressure Brady for them to win. If they couldn't pressure Brady when the Pats had a weakened OL, how will they do so now that we have a full compliment of OLmen? Furthermore, the vaunted Giants' passrush has recorded only 3 sacks in the playoffs.
Complicating matters more for the Giants is that their secondary is their achilles heel. Their best CB is Madison who has been injured off and on all year and has definitely lost a step. Their other CB is Webster. He's played well in the playoffs but his regular season performance should have earned him the nickname "toast". Ross is an up and coming CB but will be less than 100% for this game. McQuarters is nothing special.
Wilson is a decent S but the rest of this corps is inexperienced.
This all means that given any decent amount of time in the pocket, Brady should pick this group apart.
And then there's Maroney whom the coaches held back on for a good portion of the season. They wisely did so, so that he'd be fresh and effective in the playoffs. He controlled most of the 3rd quarter and all of the 4th quarter against the Chargers. Should Belichick choose to do so, I believe he can do the same against the Giants.
Finally, there's the Bill Belichick factor. IMHO, no coach in the history of this sport, not Lombardi, not Landry, not Brown nor Noll, has ever come close to formulating that one perfect gameplan for the biggest game there is. Given that BB has already seen the Giants this year, rest assured that he, his coaches and Gamefilm Guru, Ernie Adams will devise the perfect plan to dispatch one of the most dysfunctional organizations, the Giants.