Guardiola is certain that his team have all the talent necessary to take on anybody, but feels that getting the mental side of their game right is the key.
Sergio Aguero has three goals in his last three league appearances against the London side. After scoring nine goals in two games against Liverpool and Feyenoord, the Spaniard is excited how his team are starting to play.
Aguero opened the scoring in the 27th minute, heading home De Bruyne's superb free kick, and doubled the lead within four minutes when he converted Silva's teasing cross from close range.
Richarlison had the first decent chance of the game but with City guilty of some awful defending, the Watford star sent a free header wide. When Gabriel (Jesus) came last season we can not forget he had just seven or eight games because he was injured immediately.
City were in exuberant mood and added a third before the break when the excellent Gabriel Jesus latched on to Aguero's cute pass to stroke home in the 38th minute. The first game of the season was against Liverpool, at Vicarage Road, and could be the blue print for how they'll play against City.
Spanish manager Guardiola was delighted by his side's positive approach, saying: "We did not play back".More news: BSF jawan killed as Pakistan violates ceasefire along LoC
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Raheem Sterling was then brought down in the box by Christian Kabasele and, despite Guardiola insisting Aguero take the penalty, he hammered home to put even more gloss on a truly stunning performance.
But victory tomorrow would do far more than end a 28-year wait for a win against City.
Back in May Jose Holebas and Valon Behrami were Watford's centre-back pairing as City ran riot in Walter Mazzarri's last game, putting five past a makeshift defence.
And while the attack is the reason you should tune in every time City is on TV, the defense is why club has a chance to win every match.
Spanish newspaper Mundo Deportivo have started picking their own Champions League of the Week, and Stones has made his way in.
Guardiola, however, was quick to call for calm after a similarly impressive start last season ended trophyless.
Richarlison curled a shot just wide of Ederson's goal as Watford looked to re-assert themselves early in the second half but Gomes remained the busier of the two keepers and he saved Silva's powerful rising shot brilliantly on 62 minutes.