A bit of an odd question, but I haven't come across any posts about this- which I'm hoping is a good thing, but does anyone have any idea on what grounds a PR application may be rejected?

Am coming to the end of compiling all documents to send off with my ITA, and am naturally starting to wonder 'what if?'. We're getting really excited now at the prospect of moving, but also can't help wondering what if we don't get the result we want.

Can anyone offer anything to put my mind to rest? I have been totally honest in my application and have everything to support it- perhaps I'm being just a little pessimistic now that it's coming to the end.