How can you work the neck muscles if you are byyouself, and no neckmachines?

I see no one has replied to this. Why? Well, to answer your question, yes. Either get a neck harness or just lay on a bench and place a weight on your head (any side) and lift. You may want to wrap the weight in a towel to cushion it. Be careful when working the neck though as you can injure it very easy. Start light and back off if you feel any pain, pulls, etc.

FYI. You can also make the neck appear bigger by increasing your traps.