How can i do some good tattoos on the textures. I find it hard with the split in the front and back of the textures. Any help please

Layers.. son, Layers that's how to line up on seams. how i've done it was to put the tat in place on it's own layer ( I use Photoshop) and then select save copy. That makes a flat image, and then I try it out on the charater. then do a quick render (In poser) and note where the tat falls. Then back to photoshop and adjust the tattoo layer and repeat the same as the same name then back to poser and a render since the text name is not changed when poser renders it the replacement is used and then repaet till you are happy. Sound confusing? it's not just teadiuos. The are seam gides out there somplace