i want to add a PIR switch to my halloween decorations.

My wife bought a bunch of halloween decorations that make noises but they are all controlled by a push switch on each individual piece. So my options are either to run a wire to each switch back to the house and look out the window at each trick or treater or just set up a PIR.

I've never messed with electronics other than just running simple wires. I've tried to google PIRs as i was hoping i could buy some type of all in one that i could just attach to replace the existing switch. But it looks like I'll need a PIR sensor and then some type of control module to then interpret the signal to tell the light to turn on and off. Is that right? Anyone ever mess with something like this to have an easy fix?

Thanks