The 50-year-old Portuguese is in his second spell at Chelsea and looking to win his third Barclays Premier League title after a near-six-year absence.
Mourinho said: "I always said my job this time would be a different job profile. I do my work the best I can.
"I came here to give my best, knowing that this team and this squad couldn't be ready to achieve what people probably think we have to achieve.
"I'm at the stage of my career, probably the best moment of my career, which is being still a young manager but already with years and years of experience, where nothing is new for me in football.
"Everything that happens to me feels like deja vu. It has happened to me before, for sure. I'm cool, I'm normal."
Mourinho, whose side lost to Basle on Tuesday, knows he is not immune to the prospect of leaving Chelsea for a second time.
"When you are the type of personality that puts pressure on yourself, I don't think you need to be worried about anything else," Mourinho said.
"I'm the kind of guy that year after year, title after title, I don't change. I lose, I'm not happy. We don't play well, I'm not happy.
"I lose, I want the next match. I lose, I want the next training session to try to improve."