I ordered a new K&K Mic the other day. Thought it would be interesting to install it by myself. Instructions were very clear so it was no problem, except enlarging the hole for the endpin. I enlarged it by using larger and larger drillbits. 8 and 10 mm. went fine but the 12 mm was difficult. Turned out that 12 mm was more than my two drills could handle. Had to borrow my neighbours drill. It was a powerful drill that jumped every time I pressed the start button. So I couldn't hold it against the guitar. Had to start it in the air and slowly aim it for the hole. Pretty scary on a 3000 $ guitar. Anyway, I reamed it in, it made a horrible noise but it worked!
Rest of the installation was easy, takes still some time, spent the whole evening doing this.
Sounds great though, very happy with it.