I had a blast helping my friend build his hexacopter last weekend. This video includes some tips and tricks. We also had to do some interesting trouble shooting for problem that showed up during ESC calibration that turned out to be a bad soldering job (yep it was my fault!).
Anyway please enjoy a 5 minute condensed version of a fun day building the most excellent 3DR ArduCopter Hexa-B Frame + Motors + Full Flight Electronics Kit.