What do you do when faced with an incredibly terrifying possibility?

I can’t go into much details because my mother is a part of fluther :P

But the gist of it is, in a week or so I might get some news that will change my life forever. I’ll suddenly be faced with a huge responsibility and I’m scared that no matter how hard I try I won’t be able to rise to the challenge.

As the name say’s its only a possibility it will happen, but I can’t stop thinking about it. It’s all I think about and its messing with my head… I was just wondering how you would deal with something incredibly life changing? How you would prepare for it and so on.

I know this is a hard question to answer cause I can’t tell you what the thing that’s happening is. But any help at all would be greatly appreciated