The first racket will take you over an hour. After a few you will be under an hour. If you have two rackets that are the same, string one of those first. That way you will see what holes to skip and where the crosses begin. It will also show you the best spot for the knots. Only way to learn is to read and practice.
A new racket that has never been strung, should not be you first racket....Good Luck