Controling Pattern tiling in Photoshop 6?

I’m trying to make the best of using a horrible photo to make patterns for texture (vinyl fabric actually, I work for a Textile Company) and I can’t really figure out how to control the tiling. So far I’ve seen it become a trial and error issue, but I’d like to figure out a way to control that.

Also, I would like to know if there is a good method of diffusing dark edges on material maps so they don’t create a crease. Someone told me about the “heal” tool, but I haven’t found it on PS 6. Thanks.