Late, but for the sprays, you put them firmly but gently on your arm held horizontally, while the spray is upright. Make sure all of the edge touches the skin. Then you spray deeply, hold a full second, then let loose. Turn arm around so most of the sprayed area faces up.

If you did it correctly, you should have some drips. Wait a bit, like 10 sec, til the skin is dry enough that the drops don’t move off. Then turn arm back again so the sprayed area faces your face, and do the next dose. And so on.

When all doses are done, you wait and don’t touch anything with that arm for 2-4 min, don’t shower in the coming hour.