Hallo BL, and welcome aboard. I would be surprised if there were
any member here who could say, hand on heart, that he or she had never had a failure, and most would admit that failures are simply a fact of life that one has to come to accept. As regards "authorities", I would instinctively place greater credence on texts written or videos produced by someone from the sub-continent than I would on something written by a westerner, and so on that basis let me make two recommendations :
The first taught me how to cook BIR food at home, and whilst Kris's methology goes against 99% of the received wisdom, it will allow you to create first-class (and repeatable !) curries at home without first needing to learn how (for example) to bhoon spices without burning them. The second is a series of videos produced by Chef Syed Rahil Ahmed, former Head Chef at his late brother's restaurant in Derbyshire. Unlike far too many Youtube videos, there is no nonsense about "now I am going to teach you the
real secret to achieving BIR food at home"