Step 1: Separate ephedrine or pseudoephedrine from cold medicine tablets by dissolving them in a solvent, filtering and cooling the solution.

Step 2: Mix the pure pseudoephedrine with red phosphorus and hydriodic acid to produce methamphetamine.

Step 3: Filter out the red phosphorus and neutralize the acid with a lye solution.

Step 4: Add a substance that will bind to the meth and drain out the liquid meth.

Step 1: Buy Uranium-238 from Amazon.
Step 2: Boil uranium into a gas.
Step 3: Run Uranium-238 through cell membranes, and capture the Uranium-235 particles.
Step 4: Obtain 33 pounds of enriched Uranium-235.
Step 5: Buy 10 pounds of trinitrotoluene.
Step 6: Encase trinitrotoluene inside a steel box.
Step 7: Encase Uranium-235 in the same steel box with 90% concentration at minimum.
Step 8: Place a fuse linking the trinitrotoluene to a switch - either radio controlled, or manually burned.
Step 9: Detonate the trinitrotoluene. This will cause nuclear fission, which will then result in nuclear detonation.