I don't have the exact steps but wine tasters use ever changing words to describe the characteristics of wine like its flavors and aromas.
Typically the wine tasters will all sip the wine, then use an ever evolving system of terminology to describe the aromas, flavors, and characteristics of the wine.
Is it true Wine tasting is a delicate art? I'm unaware if it is or not, but there have been scientific blinding wine tastings that contradict wine tasting reliability. What do you mean by reliability? I can't say but the purpose of the blinding tastings is for wine scientists exploring the human olfactory system on things like identifying the compounds of a wine's aroma. How exactly is wine tasting done?
Modern, professional wine tasters (such as sommeliers or buyers for retailers) use a constantly evolving specialized terminology which is used to describe the range of perceived flavors, aromas and general characteristics of a wine.