New Chain Time = Sprockets too ?

[fazersharp]

I've never fitted a chain link myself, not on a motorbike anyway, so one question is can you get it very wrong or is it that straightforward to do?
Can you press the pin too much for example causing any issues?
As you can fully understand it's not an area that you really want to botch in any way or form as the aftermath could be disastrous.

That is pricecly why I want an Endless chain - if it exists.