My older brother, who passed away, recently, was a Nefmoto member back in 2012. Anyway, he left me his 2004 Audi C5 A6 2.7T, S-Line, with only 32,800 miles on it. The car looks like it just drove off the new car lot. He had returned it to bone stock, except for the K04 turbos, and upgraded diverter valves.  He even put back in the original ECU, no tune ( totally stock ).  I have no idea what he did with his tuned ECU. He let me drive the car, once, back around 2015, and the power felt unbelievable, compared to how it is today.
So, now I want to learn how to tune a “BEL” ECU, starting from the beginning. I have his laptop with a registered copy of VCDS Lite, and it also has programs called “VAG-Tacho” and “Vag-Commander”, along with the Nefmoto flasher program. 
I can tell by reading a lot from Nefmoto, that you guys are really smart, and this could all be out of my league. Anyway, so my question is: Can a BEL ECU be tuned by a rookie noob like me, or should I buy a tune from one of the several companies that sell tunes.  I’m not super intelligent, but I’m not a moron, either.  I’m a retired US Army helicopter pilot/instructor, after 20 years, so I don’t have no experience in ECU tuning / electronics. This is totally new territory for me.  I can wrench a car pretty well:   Do you think I have a chance of learning how to tune my ECU, or a spare ECU, or would I be a waste of your time. Please be brutally honest. Thank you for allowing me to join!


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32,800 original miles... The PC has vagtacho installed on it...  I'm sure that milage is NOT original.