"I have no idea what doing it at your age would wind up looking like," Shell Bell says frankly. "You might not even get a Sherlock; maybe Sherlock is only what you get if you clone yourself when you're twelve or have a twin naturally, maybe you'd get some complete other personality for a clone you made now. I'd suggest putting you in touch with Juliet's Sherlock so he can have a complete set, but he's pretty attached to Juliet and she's sort of a superhero in her world and really oughtn't leave, and you're probably pretty attached to here, and besides there'd be two Jarvises which could be weird."