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FW28z had some nice diagrams--I'm sure he'll come along and post them.
Its pretty easy if you put your mind to them. There are 3 valves connected to the water heater: One each on the input/output lines and a cross-over valve. When in use you want the cross-over valve closed and the input/output valves open. In "winter" mode its the opposite: cross-over open, input/output closed.
The only other valve involved in winterizing is the feed from the fresh water tank. Open in summer and closed when you want to feed anti-freeze into the system.
The remaining valves: low point drain (2, hot & cold), and the tank drain I leave closed all the time--only opening the tank drain to, um, drain the tank. The low point drains I crack for a second when the system is pressurized with anti-freeze during the winterization procedure. I also crack the two input/output valves to the water heater during winterization to get some antifreeze in the short stub lines to the water heater on the other side of the valves.
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