Really Dumb Dumbbell Snatch Question

I feel like I should switch my username before I ask this, but:

When I’m doing db snatches, going on DeVany’s 15/8/6 scheme, do I do each set twice - once with the right arm and once with the left, or should I just switch arms halfway through the set?

Or should I just load up two dumbbells? I’m guessing that’s the correct way although I swear I saw a video not too long ago on here where the guy used only one db.

One DB 1 set is complete when you have done the prescribed reps for EACH arm. so if your doing a set of 10 db snatches its ten with the right ten with the left thats a set.