BMW Repair: trouble shooting on electronics & electronics, bmw cars, system faults

Question
May I ask your expertise, is it difficult to diagnos and trouble shoot any electricial & electronic system faults on BMW cars?
I had been told that we need expertised to do that and every change of sensor or any electronics parts a coding is needed, is that true?
If so how could I be one of them like you do?

please advice as I had plans to start up a specialise workshop on BMW cars.

thank you and look forward from your help.

thank you
daniel

Answer
Diagnosing BVMW's is not an easy task.I have been working on them for over 25 years and there is way much more to know than I do.I prefer not to replace parts I prefer to repair the problem.Being an ASE master and BMW certified has made it easy for me but repairing cars with minimum input is quite hard.Good luck