UNDATED (WHDH) -
He started from humble beginnings on "Saturday Night Live," but 39-year-old Jimmy Fallon enters the big leagues on Monday, the night he becomes host of "The Tonight Show."
"It doesn't get bigger than the 'Tonight Show'. This is the job of your lifetime," Fallon said.
Fallon's biggest concern is screwing up the show, but his predecessor doesn't think that will happen.
"The people that make the best hosts are the ones that have actually had contact with an audience, like Jimmy. A lot of guys have come from radio, or something, and they do these things and they don't have that, they don't make that connection," said Jay Leno, the former host of the "Tonight Show."
Will Smith and U2 will be the show's first guests. Fallon is bringing The Roots along as the show's house band.
For the first time in almost 42 years, the show will be hosted from New York, in the same 30 Rock studio where the show began. A whole new set has been built for the occasion.
"The set is gorgeous. It's a work of art. It's beautiful. It's classy. It's glamorous. It's everything that New York City is," Fallon said.
In preparation for his new gig, Fallon spoke with another famous New Yorker.
"I was talking to Seinfeld about this and he goes, 'You sure you want this? You know, you do this til you die! This is the Pope job. You're gonna do this, you want this, the rest of your life? You're gonna do this job. It's up to you!'"
Fallon’s "papacy" debut starts Monday night at midnight.
Fellow SNL-alum Seth Meyers will be taking over "Late Night" with Fred Armisen as the new band leader.
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