1) Create a new character
2) Complete the sewers down to the end before you exit the sewers.
3) Save your game before exiting.
4) Load it and save as a new game, then once you exit, you can change anything you want since you have not yet left!
Enjoy!
Welcome to the forums! :icecream:
Heh, Going Viral is right. This is a very well known procedure that most experienced players use and recommend. I quite like the tutorial as it helps me set the right tone/mood for my character so I don't worry about it. In fact, it helps me learn a great deal about the nature and temperment of any new character.