How do you handle a big win?

A big win - you need to cash out. And spend on entertainment and pleasure and those things that you can not buy in the usual rhythm of life. Part with winning money easily!

Unfortunately i do not have big win in my poker history but if i do i will use part of it to fill up my bankroll and will withdraw the rest and use it to cover some bills or finance my other hobbies. Regarding the percentage left and withdrawn - it depends very much on the size of winnings, your current bankroll state and your current need of money for your normal life. One thing i will definitely not do is to start playing at higher stakes as this is recipe for disaster.