Can I calibrate a Quarq DFour 2 power meter myself or do I need to take it to a professional whos going to charge me an arm and a leg for something that should be a straightforward process. Ive seen the instructions, but the lack of clarity is staggering. Is it really that complicated or are Quarq trying to create a new revenue stream by making calibration a black art that only certified mechanics can perform. Whats the worst that can happen if I get it wrong - my power numbers are off by a few watts. How hard can it be to zero out a power meter, anyway. Is it really necessary to have a degree in engineering to calibrate a device thats supposed to be plug-and-play. Has anyone successfully calibrated their Quarq DFour 2 without having to consult the manual or visit a bike shop. Whats the most common mistake people make when trying to calibrate their Quarq power meter. Is it worth the risk of voiding the warranty to try and calibrate it myself.