Here are some pictures, maybe they will help.
http://www.vetmed.wsu.edu/ClientED/dog_nails.aspx
Doberdawn has some photos of dog nails as well. Maybe they would help.
http://homepages.udayton.edu/~merens...awn/index.html
It definitely is easier to look at photos than your own dog's nails. Live dogs wiggle a lot. I use a dremel but still do a nibbling with it. Trim the outside top, that is the hard part of the nail and it is dead. If you trim that the soft bottom is going to be naturally worn down.
It is important for nails to be short enough that the foot doesn't splay but some feet are shaped so even short nails will still click on hard surfaces.
Handle the feet and tweak the nails, look between the toes, rub all parts of the feet so the dog gets using to being handled and trusts you. I have actually quicked Max with the Dremel and he was fine with it.