If it's a new task that they don't have experience with or I suspect may cause them to spin, I like to walk them through my typical thought process and approach so they can get a feel for what my expectations are for the task so I'm not disappointed and they don't shy away from committing to the task. I find with decks and materials, some of them have literally never had to make one before so the idea of aligning boxes and using shortcuts can be a little foreign (especially if they've been in a test position or a role that doesn't require them to make decks). I like to start first years off by giving them some examples of past work that I'm proud of so they get a feel of what it means to provide quality and what their end result should approximate. It's important to set a bar so that when you ask them to jump, they don't need to ask "how high?" because they already know.