Esteban Gutierrez has admitted his might not be an easy transition to formula one in 2013.

The 21-year-old rookie is replacing his Mexican countryman Sergio Perez at Telmex-backed Sauber next year.

In 2012, he finished the GP2 season in third place behind Davide Valsecchi and Luiz Razia.

"I am fully aware that F1 is not easy, because it's the highest level of motor sport," Gutierrez is quoted by Brazil's Totalrace.

"It's true that I have not been consistent in GP2, but I think this has been the most rewarding season on my career because it's the kind of experience that gives you a better perspective for the future.

"I will try to look for consistency in F1 and when I get it, I can start thinking about great results," he added.

"First, I have to go step by step, adapt, and for that the beginning of the season will be very important."

Gutierrez admits he cannot say for sure that he is ready for F1.

"It makes no sense to say I am 100 per cent ready because it's difficult to judge.

"But definitely I am doing my best and using all the time I have had on the track to improve my knowledge with the car, not only for the driving itself but also the feedback to give to the team.

"In F1, this is crucial," he concluded.

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