Dirt Nap watches as Mable works apparently applying her occult training to the exercise.
"That's...good, Ma'am, really." Dirt Nap says encouragingly. "Might be a bit of overthinking it. At least for me, it's not so much my concentrating to make it disappear, as sort of letting myself--making myself, to be honest--relax and forget all about it being there, only doing it in a way that it's 'catching', so to speak." Dirt Nap 'explains, perhaps unhelpfully.
"It seems to be kind of learning a state of mind, more than a...formula to concentrate on."
Dirt Nap is quiet for a moment and then says, "It's a step by step thing. I had to really work on this part for a while, about a month and then came back for the lesson on how to use it to hide the Beast."
Krieg's player did the teaching scenes so effortlessly seeming! LOL! I like that as a Gangrel, Dirt Nap is more intuitive than overtly cognitive in his process, which can make it harder to teach! Also the Coils are either a thing or not, there's no 'casting' them like magic spells like the Crone? That's my story and I'm sticking to it! LOL!
The actual roll would be Wits + Larceny + Obfuscate + 2 for such a small object being hidden, so for Mable I guess it'd be with a -2 for not actually having Obfuscate yet, but for teaching learning purposes, we're kind of fudging it anyway; in the teaching thread where Dirt Nap learned, Krieg's player said not to roll at all, but I like to make the roll with the Gangrel penalties because it highlights how difficult it would be.
So basically up to you! The one thing is, as I understand it, you can only get ONE level of a discipline per RL month of experience spend, so Mable would learn Obfuscate 1 this month, and then they could meet again next month and do the second level, the Mask of Tranquility which doesn't even require a roll! Much easier!