Beware of self-proclaimed experts as they are rarely what they claim to be. Expertise can at times be subjective and skin deep which is why you should accept expertise cautiously (especially the one where it is self-proclaimed).
I have experienced numerous examples where so called experts were miles away from what they have claimed to be and as such our relationships had no potential to grow and advance as they were initiated on lies and false promises. Professionals, yes…experts on the other hand are very hard to come by and generally don’t consider themselves to be experts which is always a good tell to be aware of.