Before going any further, do this. NOW. Put your martini glass(es) in the freezer. The glass must be frosty cold. Frosty. Otherwise, just take a pull from the damn bottle.
Ice in a shaker
Gin - a good gin, don't have a classic martini with gin from the bottom shelf of the liquor store
An olive or two - the green pimento-stuffed one
Pour 1 1/2 ounces of gin into the shaker over the ice. Shake it like a Polaroid picture while you sing the alphabet song. To yourself though. Grown women shouldn't sing the ABC's while shaking gin. People may wonder. Why sing that song? Because you want the gin nice and cold. That takes time.
Here's where the classic martini recipe become's D's version. And it has to do with the dry vermouth. A martini typically has a drop or two of dry vermouth swirled around the inside of the glass before pouring in the gin. Sometimes people will shake (or stir) the vermouth into the gin and pour away. I prefer to be contrary and, as my dad taught me, not use vermouth at all. Keep that bottle far away from the martini glass.
Pour the gin into the super cold glass and plop in the olive. Sip away. Rinse. Repeat. As needed.