As an employer I had to learn how (teach myself how) to do this....generally people know in advance, although sometimes it's a complete surprise. If the person has an idea what's not working, they will be relieved.
So, don't worry about it....you'll kick yourself afterwards for having been upset...and no one ever believes you when you say that "this hurts me as much as it hurts you"...even though there might be a time when it's true.
Just sit him/her down and say, I'm sorry but we have to let you go....sometimes the less you say at the time, the better. And, if they're entitled to anything upon leaving, be prepared to discuss this and even give them some documents if they're required.
Hope this helps....GOOD LUCK & let me know how it goes!
Edited by: EWL978 at: 1/24/2013 (09:23)