So we opted for a better solution: we hired a UX architect (or whatever the title is) from http://dlabs.si/ - He performed live user testing and analysis with us and delivered high fidelity wireframes, which resulted in understandable application flow, without the need for a walkthrough (or me spending time learning Kera). Granted, it wasn't free, but it was well worth the money, and it was one-off payment, as opposed to Kera's subscription model.