I had an auto-siphon a long while back, but stopped bothering since I didn't think it offered much that a standard racking setup didn't.
Most of my transfers these days are either closed-system transfer where I push it with CO2 or done with a valve, so no siphon in either case.
With that said, filling your hose/cane with sanitizer as brew_cat suggests, placing the cane end in the beer while keeping the hose end closed (with a clamp or just putting your sanitized thumb over the end) while keeping the out end lower than the end of the cane works just fine.
It's not a difficult process, but it does require that you understand where either end of the siphon is and what does and doesn't cause outflow from one end or the other. I have troubleshot my process many times with water before doing it for real, and those "dry" runs really helped me know for sure what's important and what can screw things up.