1) Stack everything parrallel to the floor, so it cannot fall over and smash you - causing physical pain and injury, and terrible embarrassment.

2) Coke bottles make efficacious ice packs - they are curvy, chillable, and you can drink them.

3) Clamp that shit down, yo. The bit will bite, the piece will fly, and you will cry.

4) Always make a note of the nearest fire extinguisher, especially if you are not working in your usual space.

5) Spent NiCad batteries can be revived (with much danger to life and limb, amateurs,) by using a mig welder (or anything else with enough voltage). Voltage will zap the crystal dendrite growth that is mostly likely keeping the battery from holding a charge (thank you Instructables!).

6) Brass Screws: No. Just, No.

7) Music. In the shop. Seriously, it will keep that ADD bit in your brain from breaking down and crying over having to mill out seventeen of the same thing. Mr. Robotics like The Bone. The Head Rotor likes 9Beet Stretch. I like Orbital or Rick Astley.