Caley Thistle have scored six goals without reply to win their opening three matches and comfortably beat last season's runners-up, Motherwell, to ensure they travelled to face the champions in top spot.
Butcher, whose side won at Celtic Park early last season, said: "There's a supreme confidence flooding throughout the team but there's a realisation that, in all three matches we have won, there's been a lot of hard work and effort that have gone into these games.
"Whether it be running off the ball, covering, defending, tackling, our boys have worked their socks off and that's what they have to do on Saturday.
"But the lads know that. There's a good understanding and confidence and relaxation about going down there because the boys know what they can do and what they have to do.
"There's a great belief in the team but there's a steady belief. We know if we keep on doing what we are doing, trying to penetrate, pass the ball, that we will create chances.
"We have players in the team that can change games and win games on their own and players who can see the game out if we are ahead."