Writing the ending

I am SO near the end of Unofficial Girl - 79,728 words and counting - and can't wait to finish and start tweaking and polishing and sending it out to beta readers.
Usually I find the end of a novel easy to write, because I don't start writing a book until I know how it will end. The last couple of chapters are the home stretch. But with Unofficial Girl, I made a last minute decision to change the end, thus making it much more challenging.
I just hope readers like it...
Sorry for this rather short post, I need to get back to the WIP.