One thing - the instructions end up: "Don't be afriad to experiement with the tension. It acts like the sound post in a violin. A small adjustment can make a big difference."

And I found that was quite true - to start with I had the tension rod screwed in a bit too tightly; relaxing it a little improved the sound a lot. That just involved slacking off the strings so I could get an Allen Key inside, ten seconds worth of adjusting using that, and then tuning up again.