AFAIK Switzerland is not in Schengen so you need to enter via an international airport. I chose Grenchen last time.
Most countries apart from the UK also have
exit customs. Switzerland has a number of airfields where you cannot enter the country but you can leave via them, and the facility is on a few hours' notice. I doubt anybody ever turns up to check you out; you just fax a certain number in advance to say you will be leaving via there.
My limited experience of Switzerland is that they like their special weather briefing machines, through which you can also get notams. I could not work out how to use these things, and reverted to using a laptop with GPRS to get weather etc.