Robin: That's a pretty good article that covers the basics fairly succinctly. Also good for some people who think they know but maybe learned improper techniques originally, or didn't pay attention the first time.
Getting into the home cocktail making is not as challenging as it might seem. The trick is avoiding the usual trap (which, admittedly, wine geeks have already proven to be poor at

) of trying to buy a bottle of everything, taking over too much space, getting too much stuff, ticking off the spouse who just doesn't understand all this, and having to cut back. You know, just like wine.
Many, many, many cocktails don't require a vast range of spirits and adjuncts. Some of the great classics---the Manhattan, the Martini, the Negroni, the Sidecar, etc., etc.---are amazingly simple to make (although a bit more difficult to make
well.
Making cocktails is like when you were a kid with a junior chemistry set---with the two major differences being you generally don't blow things up and you get to enjoy sampling the results of your chemistry experiments.
I wrote a whole series of articles a couple of years ago---very popular, they were---about "The Twelve Bottle Case" of booze---you know, if you were stranded on a desert island and could have only twelve bottles of booze, that kind of thing. Two things became clear: it was entirely possible to pare down one's spirit needs to that few bottles (not counting re-supply) in that small a space; and the selection generally revealed, not least of all to the participant, preferences and predilections they had never thought that much about before.
(That being said, I still vastly prefer the cocktail scene...going out and having a bartender make the drink.)