Any one had any toughest experience in brewing tea?

I would have to say Bi Luo Chun green tea. I tasted the same tea in
the store brew with the seller and it tasted really good, with mild
nutty flavor and lingering sweet undertones. Back at home i tried
brewing it various methods here and there I couldn't get the best out
of it. Sometimes it taste really stale, i tried with more leaves,
shorter brewing time, hotter water, etc but I still couldn't get like
how it should taste at the store. This is one particular incident with
BLC green tea. Other version of BLCs i had bought did not have this
issue.

I heard that preparing gong fu cha is really a skill!
Other kind of tough to brew tea is wu yi rock tea especially some Da
Hong Pao.