Format a "particular" Post differently

Okay. I now have just the most recent post of a specific category appearing at the top of the center section of my static homepage.

http://www.shepherdjim.com
Please be kind -- the Shepherd Jim w/site is my sandbox where I'm testing stuff.

Now, how do I format the elements of THAT post's <div class="post-bodycopy clearfix">, div class="post-headline">, etc. without changing the appearance of all the other posts on single, multiple, search, etc post pages? I know I should be simply targeting in CSS but I'm not clever enough.