First you'll need to load the character with the shaders you want to convert. For this tutorial I'll be using Daz's Michael 4 with the mat pose "MATerials hi-res" supplied with the figure. I open a new scene with my desired lighting, environment and default Superfly render settings, and load in the figure, then apply the mat pose. This will work with either mat poses or materials applied from the material room from material collections, doesn't matter which so long as the shaders get applied to the figure. Here's how he looks right out of the box:
And here's a glance at the material room with these shaders in place:
You see how there are a bunch of nodes plugged into different stuff making up the Firefly shader...we can get rid of most of those. Hold Shift and click on the diffuse image node (Color_Texture, in this instance) and the bump image node (Image_Map_2) so they are highlighted, and then right-click and Invert Selection to select everything else, and hit Delete. This will leave you with just the diffuse image node and the bump image node.
I like to neaten it up at this point. It doesn't really matter, I'm just a neat freak. You don't have to change any of the other settings in the Poser Surface, they will be taken care of by EZSkin. Now we're ready to save some materials to make this faster.