You hover over the green button that says 'hire' and click on it twice. Confirming your purchase later on.

Takahama seems like an ideal candidate to test this shrink-ray out, though should she try anything funny with your property as stated in the reviews you have read the manual of the Shrink-Ray and discover it's Hypnotic abilities. Simply hyponitizing them should be efficient enough as a self defense.

Now begs the question on whether you should shrink now or later on when she's here. If the reviews are true, it's likely she'll charge extra for this if she knows. From then on you have to pick whether you should Lie about how you do it too...

Or you could Shrink Now. Set it up so she's not aware your here and try to climb her body. Which is highly riskier than the other choice, and likely spelling out your doom