I just ordered a press, size 20 die set, and snaps today, too! That should be all you need. I plan to use them on some pocket dipes I am making. If you "hide" the snaps between the layers, and the snap is only going through 1 layer, then you probably need a reinforcing layer (same material will work, or anything else you have on hand since it will be hidden) so that you have at least 2 layers of material for the snap to go through.
She changed the order to "shipped" today, too! I am so excited!