Mirrors: Do a search on "mirror" in the forum. My vote goes to the Take-a-Look, and no, it will NOT weigh your glasses down at all. It's incredibly light. Awesome product! I would never ride on the road without it.

Tools: Yes, there is a bolt under your saddle that can be tightened. You need a small multi-tool with the various sizes of hex wrenches. These can be purchased at any LBS or online.

In a rush or I'd be more detailed. I am sure you'll get other responses too. Good luck!

Emily