Zooming in on one layer in After Effects I desperately need step by step instructions on how to zoom into the child sitting in the window. This composition is an animation, I have a bunch of layers but I specifically want to zoom into the window as a track motion effect. I REALLY do not want to scale every layer larger one by one, because I have approx. 15 layers. Please help! I've extremely new to AE.
Thats simple, pre-comp what you have right now and create a camera layer. Then make you composition layer 3D. The look of you layer will not change unless you add lights or rotate the camera. Then you can pan around and zoom in your picture with the camera.

Thats how you do every sort of zooming e.g. camera animation in after effects. Animating the scale of layers is just a mess like you already realized.