The 50-year-old Portuguese is in his second spell at Chelsea, seeking to win his third Barclays Premier League title, after a near-six-year absence.
Winning the Premier League this season would be a greater feat than winning Chelsea's first title in 50 years in 2004/05, Mourinho believes, as he must oversee a squad transition at the Blues.
He 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."
Carlo Ancelotti is the only Chelsea boss to have delivered a Premier League title since Mourinho's departure and so many have tried and failed that some have suggested the manager's office should be fitted with a revolving door.
Mourinho, whose side lost to Basel 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."
December will be a key test of Chelsea's title credentials.
Nine matches, beginning at home to Southampton in Sunday's first of seven Premier League games in the month.
Many teams at Stamford Bridge opt for a defensive approach.
Mourinho wants Southampton to stay true to the style which has rewarded them so well so far this season.
He said: "The game is about two teams. Maybe they think they come to play that game and they can't do it, because we don't allow them to do it.
"Or maybe they think because we're at home we are going to dominate, we are going to make a game only in one direction. And they come here and they don't allow us to do it. You never know."
Asked his preference, Mourinho added: "I want them to come."
Mauricio Pochettino has been praised for his job at Southampton in the 11 months since he replaced Nigel Adkins as boss.
Mourinho added to the plaudits.
"He has a dream job," the Chelsea boss said.
"Good players, a good club, big trust, big stability, no pressure.
"(If Southampton) finish fifth or sixth, incredible job. Finish seventh or eighth, good job.
"He has a very good job."
Mourinho also backed striker Dani Osvaldo to perform in England, despite Southampton's £15million striker scoring just once so far since his move from Roma.
Mourinho added: "He's a good player. I was with him in Italy, also in Spain. He's following me.
"It's very difficult this country, especially for strikers. Sometimes they come and they adapt immediately.
"But normally it's not an easy country for a foreign striker to come and immediately to do it."