As a relative newcomer to composites, I have found that there is certainly a great deal to learn, and even after more than 4 years I am still very much a beginner, but have learnt to hand laminate reasonably well, and am able to make good quality GRP parts for off-road bikes, which I have sold all over the world, without having a single problem.
I have been lucky in the fact that someone who works for me, is a highly experienced laminator, who learned his trade through a proper 5 year apprenticeship scheme, and I am able to call on his expertise when I have any sort of major problem.
Thing is though if I asked him for advice, and then chose to ignore this, due to my feeling that my scant understanding of composites is of more value than his 35 years of experience, then he may well have good reason to feel I was a fool, and perhaps rightly so!