Man thats a lot more than I ever did.
I just cut, and sew with a heavy thread.
Just make sure the seams are sewn on the outside, so they don't rub the dog.
The neoprene cement makes a flat seam like factory. Some just go with that. The extra step of sewing ensures they don't pull apart. May be overkill, and it's kind of a pain, but the last one I did lasted 12 years of hard use.