Step 1: Tools
1) Soldering Iron (solder, flux)
2) Hot Glue Gun
3) Wire strippers (or sharp finger nails)
Step 2: Materials
Step 3: Assemble LED's
Note that NOT using a resistor will quickly burn them out as LED's will take as much current as can be supplied by the source. Since the source can usually always supply more current than the LED can handle they burn out.
Step 4: Switch and Battery Case
Step 5: Finalize
Put in batteries, test and find scorpions.