This is such a great question.... I used to use a diffuser for my curls, but now I just put the hair dryer setting to low. I try not to move the curls around too much while drying (mostly to add some volume at the very top of my head). I don't put heat on the ends of my curls either. Personally, I don't see THAT much of a difference between the diffuser and the low setting. 

Great question!

If you REALLY don't want to buy a diffuser, using your blow dryer on the lowest setting will work.

However, a diffuser is made to distribute the heat through your hair, and this means you'll get less frizz from your natural curls. But as long as you continue to rotate the blow dryer as you dry, you'll get the same results.

More importantly, though, you want to invest in good styling products for curly hair (like Ouidad products, which are created JUST for you). That will make more of a difference than whether you use a diffuser or blow dryer.

Hope that helps!

Yes.  After you wash your hair. slightly run a wide tooth comb through your hair.  Then bend over with your hair facing floor, and hold dryer with diffuser on your hair at the same time you are scrunching the curl into your hair.  DO NOT COMB WHEN DRY, OR IT WILL BE FRIZZY.  This works for me with hair that's straight in front and curly in back.  Use pick to pick out volume and height.

You could also just let your hair air dry. I can tell the difference when I blow dry with a diffuser or without, but I don't see a huge difference between the diffuser and air drying. (I just don't always have the time to let my hair dry naturally!)