No no, I find the function that causes the display inside the plugin, and then I put that into my theme where I want the plugin.
For instance, to display my podcast with ratings I use:
<?php if (function_exists('the_powerpress_content') ) : ?>
<?php if( $episode_content = get_the_powerpress_content() ) : ?>
<div class="powerPress">
<fieldset class="episode-box">
<legend>Voodoo Empire Mix</legend>
<?php if(function_exists('the_ratings') ) : ?>
<?php the_ratings(); ?>
<br />
<?php endif; ?>
<?php echo $episode_content; ?>
</fieldset>
</div>
<?php endif; ?>
<?php endif; ?>
To conditionally display each as appropriate. Sometimes I can find functions to call from plugin instructions, from plugin author websites, or from actually having to look at the plugin code