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Lay out the resistor, photoresistor, and transistor. Bend away one of the transistor's three leads. Trim the photoresistor's leads. Connect the battery compartment to the photoresistor. Connect the photoresistor to the transistor. Connect the 4.7k resistor to the photoresistor.

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These are the components of your robot's circuit. While you'll use two of the transistor's wires (or "leads") in the circuit, one of the leads must be left alone for later; you can use the needle nose pliers to bend this lead over. The photoresistor's two leads are usually an inch to an inch and a half in length, so use the wire cutters to snip all but about 3/4 of an inch off of the leads. This will make the photoresistor less cumbersome to mount later. Take the other exposed end of the wire that you soldered to the battery holder, then solder it to one of the photoresistor's leads. Solder each of the photoresistor's leads to each of the unbent transistor leads. You'll solder one end of the resistor to the photoresistor lead that isn't connected to the battery compartment's wire. At this point, your photoresistor should have one lead that's connected to a transistor lead and the battery compartment wire, and one lead which is connected to a transistor lead and the resistor lead.