Cammy accepts the trip to Watford represents an "immense challenge but we have a lot of young guys in the squad and they won't be overawed, that should stand us in good stead.
"Saracens, like us, have been struggling to find their form but they have some world class players and there is always a good atmosphere at Vicarage Road.
"If we can get a result there, or at least be in close touch, then I believe we will have a good chance in the second leg at Hughenden the following Friday.
"Our Celtic League form has not been the best but this is our last chance of any silverware and, if we can get some momentum going for the rest of the season, that would be great," said Cammy.
"We expected a bit more from Montpellier in Round 1, particularly as they were going so well in the French Championship. We would have preferred a sterner test – though we know we will certainly get that against Saracens."