It's not super clear what you need to do, but Spine doesn't currently have numeric entry for moving mesh vertices. You can select a mesh and set the translation to world 0,0 and that will place the centroid of the mesh at world 0,0. If you do this with many meshes at once, it will set the position of the centroid of all the meshes at 0,0. It works this way because a mesh attachment doesn't have the concept of a single position, it is instead just a list of vertices which each have a position.
Placing images in Photoshop and using the script may or may not be easier than placing the manually in Spine. If you do want to use the Photoshop script, you can use Import Data into an existing skeleton, which may help salvage any animations you've created.
