The first thing you'll need is one of those telescopic mirrors that mechanics use. You can get one at most hardware stores or any auto supply store. I started out with the small sized mirror which worked just fine, but this time I got the jumbo size to "upgrade".
You'll also need 2 or 3 alligaror clips. The reason I say 2 or 3 is this: you'll need 2 alligator clips and one "just clip". I used a small portable reading light that I got at the $1 store. This way I always have a handy light. If you don't want to bother you can use another alligator clip (for that matter, for this part you can use a clothes pin.)
Now for attaching everything, you can use either solder, or like I did, Epoxy weld, or JB Weld. (I stink at soldering). Some zip ties might also prove handy.
For tools, all you really need are a pair of pliers. I made the one pictured with nothing but a multi-tool.