I think it's always going to be finding clients for the vast majority. And funny enough, it's the one area that gets the least attention on forums, or through support channels (whether it's the machine manufacturers, 3rd party platforms ie. Wall Print Academy, etc) At the core of it, I think the vast majority of people getting into this space think the idea sells itself, or at least underestimate the entrepreneurial skill and sales knowledge one needs to build this into a successful business. A lot of the solution for this is simple entrepreneurship 101 to start.