1. Hold one bean bag in your dominant hand while standing, facing a wall, about a foot away.
2. Drop the bag. There, that's over with. (You'll be doing it a lot.)
3. Pick up the bag.
4. Toss the bag from one hand to the other, keeping your elbows loosely at your sides, until you consistently have it arcing at about eye level before descending to the other hand.
5. Do that 100 more times.
6. Hold one bag in each hand (drop them once, if you like).
7. Toss from your dominant hand and, when the bag is at the top of its arc in front of your eyes, toss the other bag. Catch them both.
8. Repeat without pausing another 100 times.
9. Hold two bags in your dominant hand and one in your other hand. Toss the first, wait for the top of the arc and toss the second, wait for the top of the arc and toss the third.
10. You're juggling. Drop all the bags to celebrate.