I'm still a newbie at aquariums, but here are a few simple tips on siphoning. If out the window or door doesn't work/isn't convenient, look for other options. I live in a cold climate, and siphoning out the window would result in a miniature ice skating rink, so I siphon into our 1/2 bath toilet. Sinks, showers, and bathtubs are all great, and lots of furnace rooms will have a floor drain by the water heater.
also, if you use a hose adapter to fill the tank, you can also use it to start your siphon. Just turn on the water for a bit, then turn it off, unscrew the hose and let it drain.