It's very easy to use both. Just install the mod, then follow the instructions for the css stars, replacing the "rate 1" etc links from the mod with the list of 1, 2, 3, 4, 5 in step 1 of the css star tutorial.
This is how my rate_form.html template looks like
<span id="kbrating">
<ul class='star-rating'>
<li><a href="javascript:rate('1');" class="star1">1</a></li>
<li><a href="javascript:rate('2');" class="star2">2</a></li>
<li><a href="javascript:rate('3');" class="star3">3</a></li>
<li><a href="javascript:rate('4');" class="star4">4</a></li>
<li><a href="javascript:rate('5');" class="star5">5</a></li>
</ul>
</span>