A watch or bracelet may get in your way. Gather your tools. You will need a philips head screw driver. A number two works best. It doesn't hurt to have a few sizes.
Some screws are smaller than others.
You will also find a set of curved forceps handy, and a set of long curved tweezers. You will need them when you drop screws inside your enclosure. Do this particularly if you will be moving your finished RAID around, or shipping it. We also like to keep a couple cans of compressed air around, for blowing any dust out that may settle while you are working. Set the mood with some good tunes.