Anyone can make a 7&7, it's one of the easiest mixes to make and very hard to screw up.
Basically you take lemon-lime soda, 7-up works good, and Seagram's Seven Crown Whiskey. With a handle of Seagram's I normally buy two 2 liters of 7-up.
The recipe is 4 part 7-up, 1 part whiskey; and you add more whiskey to the recipe for every drink thereafter.
That's a little weak for my taste, so I normally do 1 part/ 1 part. Stir & garnish with ice and you have yourself a tasty 7&7.