If you enjoy a salted glass, prep the rim of your glass by rubbing a lime wedge along the rim. Dip in tequila salt, and set aside.
Make the marg:
Fill a cocktail shaker with ice and add tequila, triple sec, lime juice, simple syrup (if using), and guava nectar. Shake until the sides are fully frosted.
Serve:
Add fresh ice to the prepared glass and strain the margarita into it. You can also use the ice from the shaker; this is up to you.