How to transfer wordpress.com domain name to wordpress.org

I’m stuck with a similar problem..
My domain name is from crazydomains.. I transferred the named servers to those of WordPress.COM…

Now a few days later I have realised that I really want wordpress.org..

So I have found myself a free hosting site..

But this is where I’m stuck.. If I transfer to the named servers to the hosting site, I lose my blog at wordpress.COM & when I install wordpress.ORG in my control panel on the hosting site, my URL for my wordpress blog then becomes http://kraftykarensblogspot.co.uk/wordpress…

rather than just the plain simple http://kraftykarensblogspot.co.uk that I want to keep but use for my .ORG wordpress blog..

Please, please can someone give a defined answer to this? As the those links above just have me more confused than ever.
I have spent the WHOLE DAY trying to sort this.. maybe I’m missing the obvious & I’m being simple..
If so, can one of your clever people please help me?

Thank you.
Karen.

Sorry esmi I didn’t get to the forum welcome page I came straight here from a google search..

Will post this under new now