never seen it done with ginger ale!
2 different drinks (or methods of drinking one drink I should say!)
tequila slammer you mix 50/50 with a fizzy drink of your choice in a sturdy glass with plenty of space left after you add the drink. You then place your hand over the top of the glass and slam it down on the bar/table hard then drink as fast as possible. (you can use champagne as the fizzy drink if you really want to bet hammered!!)
Tequila shots are often done with salt and lemon, then as above says you pour a little salt onto the back of your hand lick the salt, knock back a neat shot of tequila and then suck the lemon.
But I'd recommend staying away from tequila all together!!! dangerous drink, I've done many stupid things and have suffered many injuries due to it!!