Presence Detection Seems Too Hard

Setup, Configuration and Use Beginners
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I assume you have the Network binding installed.

  1. Create Things, one for each of the devices you want to monitor for presence.
  2. Create the Group Item as described in the linked tutorial above
  3. Create Items and link the Item to the Channels on those Things. Add those Items to the Group created in 2.
  4. Copy the Rule linked to above to a .rules file.

You might find some resources to help get you started with generic concepts in openHAB in How to get started (there is no step-by-step tutorial).