Push shift+ctrl+c all at once. A little box should appear on top. Type in "TestingCheatsEnabled true" If it says its not a valid code or whatever, take out the caps and then it will be ok. Now that that's in, shift click on you sim. you can have two options: age transion and modify traits. There you go.
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There Shouldn't Be Any Trait Restriction For Any Profession Or Job In The Sims 3. Traits Just Change The Way Sims Act.
You don't change the traits, once they are set on the game, you can't change them, but you can change some other things.
you can heres how ( well an example) say if you sim is messy if it does clean work it will change there is no special cheat to change it magically sorry :-(
You can't change your sims height..
You will need the following traits to become a tattoo artist in The Sims 3 Ambitions: Dramatic Friendly Artistic Charasmatic Perfectionist