The Blues begin their Champions League title defence against Zenit St Petersburg on Tuesday.
"Nothing is like belief," said Tuchel, whose side has won all five of their games this season.
"I reached the final the season before [with Paris St-Germain, losing to Bayern Munich] and had a feeling it was a big achievement.
"Not to do the last steps was a huge difference, but when you do the last step nothing compares.
"It really changes something for everybody. The most important [thing] is not to look back, but keep the feeling and the hunger.
"It is addictive, this game is about winning because it changes the atmosphere and feeling and gives you natural confidence."