I'm not a lawyer, and English law is different from American, but I reckon that I can tell the difference between good and bad lawyers by talking to them for a while about various cases in their speciality and listening to them explain the various arguments and counter-arguments.

I've heard people who make a good living from the law make incoherent wishful-thinking type arguments about which way a case should have gone, when I can see perfectly well how the judge was compelled to the conclusion that he came to. I wouldn't want such a person defending me.

Presumably if you are yourself a good lawyer, it shouldn't be too difficult to do this. The law is fairly logical and rigorous.