1. Turn off water from tank to house
  2. Turn off water to tank
  3. Turn off gas
  4. Turn pilot off
  5. Crack tmp valve and drain water to toilet via an inline pump. One end can be a braided hose and the other a regular hose. The drain is at the bottom. A screwdriver is used to open the valve for draining.
  6. Once tank is drained, remove gas line attached to tank and fittings.
  7. Cut and remove hot and cold lines from top of tank
  8. Move tank out and move new tank in. Reconnect new fittings, new copper and perhaps new pex where necessary.
  9. After reinstall, turn water back on and check for leaks with 'Leak Detection' fluid.