... This routing of payments will either be extremely cheap or have no cost, depending on whether node operators in the route charge a fee for being routed through.
...
Has it already been specified what is necessary to run your own Lightning Network node?
I guess that you would need one of the Lightning Network clients alongside with enough
locked Bitcoin to provide liquidity. Besides, it is probably necessary to be connected to the internet
in order to route transactions.
Which other requirements do I miss?