BEDA 28... I want to write a book

OK, I say this at least once a month to someone
I tell them, "I'm writing a book," and some of these people don't know me so they're like "oh really? cool!"

But the people who know me go "yeah? what else is new?! -.-" And then they glare at me the glare of death and destruction. But seriously, I could barely do BEDA, like I fail at writing on any kind of schedule on the computer mostly because there are so many potential distractions, and I'm getting old and losing my creativity, and I'm just boring...

But this time, I got a JK Rowling type vision of the story, and I have the basic outline, and the vision was of the ending, it's like a gift.

The only problem is, that it's just so... DONE... like the story, it's been told, but I feel like if I'm able to just finish writing this, writing another one will be easy. Everyone says that the first novel is the hardest. One of the main things that I feel that keeps me from being a novelist, or in fact, wanting to be a novelist, is that I sometimes don't feel like I CAN keep up with this very serious demand to write on schedule and well an to a certain number of words?! what if I don't have the words?

I really want the words =/