How can I hard code my sidebar?

You can…

1. Enter your sidebar.php file and remove everything..
(better to just remove the code that calls the widigtized sidebar see examples)

example 1 (it might look like this):

<?php if ( function_exists('dynamic_sidebar') && dynamic_sidebar('pages') ) : else : ?><?php endif; ?>

example 2 (it might also look like this):

<?php wp_nav_menu( array( 'theme_location' => 'primary-menu' ) ); ?>

.
Then you need to write your own code…
Every thing you might want to show in your sidebar.

Lets Say you want to show the latest post
so.. you need to right the code for it:

<h2>Recent Posts</h2>
<ul>
<?php
    $recent_posts = wp_get_recent_posts();
    foreach( $recent_posts as $recent ){
        echo '<li><a href="' . get_permalink($recent["ID"]) . '" title="Look '.$recent["post_title"].'" >' .   $recent["post_title"].'</a> </li> ';
    }
?>
</ul>

(source: http://codex.wordpress.org/Function_Reference/wp_get_recent_posts)

.
This would retrieve a list of recent posts.
In this manner you can build parts of your sidebar in your sidebar.php file or which ever file you want to include inside your template as a sidebar file.