It isn't much of trouble when switching languages while typing. All it needs is a toggle that after sometime becomes quite instinctive for the mind, not that easier though it seems when it comes to switching the languages while speaking.

Well, at least for me it has not been easier. Everyday I interact with so many people in Kannada that switching back to English sometimes gets me staggering.

This reminds me of something that someone told me long time back: "Think in the language you're supposed to speak". That again, needs some toggle. A very good toggle between thoughts in different languages!