It's a good thing to be able to tune a saw yourself. You just have to learn what to listen for and do it, or if your not confident, take it to a shop. A simple carb adjustment shouldn't cost much and they might just do it for you while you wait.
Basically, as you screw the high speed in, it runs faster. Too fast and it blows up. Conversely, as you screw the high speed out it runs slower. Too slow and it loses power, smokes, wastes gas, and carbons up.
The proper RPM is where it just starts to four stroke. Listen to the Madsens sound clip and then adjust it at wide open throttle with a bar and chain on.
If the low speed is screwed in too far it won't idle. If it's out too far, it will stall when you idle it for a bit (30 seconds) and then move it around (quickly tip it forward).
You can also buy a tachometer. This will allow you to adjust the saw exactly to manufacturer's recommendation. A decent one costs around $100.