What size allen key will I need for the bridge? And how do you get it to fit in the space so as to turn it?

7/64 and get a ball-driver type or a short (or shortened) Allen key. There's a whole list of tool sizes for reference here: http://club.alembicguitars.net/index.php?topic=200.0

If you can't find locally, they are always on Amazon.

Literally was just popping in to say I found the list. Thanks!