I guess this sentence was from a chat between you and some Chinese person, I think s/he was trying to be funny but a pity that I don't think even common native Chinese can get this. However I'm pretty sure s/he did hint you the first step of practicing '葵花宝典' ie 'if you want to practice '葵花宝典' (a kind of secret, outrageous Kungfu, only for men), you have to castrate your... first of all. lol.

笑傲江湖挺好看的。 欲学此功，必先....，难道阁下...？ haha,just a joke. don't mind.

the mean is the people who said that comforted himself or herself ，and the "葵花宝典”is a joke too. Do you understand what i say?

I am sorry,I dont understand what do u mean. 你是说你现在学会了葵花宝典最具杀伤力的一层----自我疗伤了么？