Ok so just a touch should be ok.. I'll add more than one coat over time. What did you use to apply it? Kitchen towel? Toilet tissue?
I just used my hand. It was easy to tell if it is too much because it won't absorb. If you have some left on the case just wipe it away. Let the case sit a while before applying additional coats. The leather can only absorb so much before it just sits on the surface but again, just wipe off the excess and it should be fine after a little while.