custom fields: meta description and keywords

can anyone help me changing my header.php to have meta description and keywords for each page (not blog post), with custom fields?

it would be very nice to do it without plugins ??

thank you wordpress users/community

my header.php

<title>
    <?php if ( is_home() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;<?php bloginfo('description'); ?><?php } ?>
    <?php if ( is_search() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;Search Results<?php } ?>
    <?php if ( is_author() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;Author Archives<?php } ?>
    <?php if ( is_single() ) { ?><?php wp_title(''); ?>&nbsp;|&nbsp;<?php bloginfo('name'); ?><?php } ?>
    <?php if ( is_page() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;<?php wp_title(''); ?><?php } ?>
    <?php if ( is_category() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;Archive&nbsp;|&nbsp;<?php single_cat_title(); ?><?php } ?>
    <?php if ( is_month() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;Archive&nbsp;|&nbsp;<?php the_time('F'); ?><?php } ?>
    <?php if (function_exists('is_tag')) { if ( is_tag() ) { ?><?php bloginfo('name'); ?>&nbsp;|&nbsp;Tag Archive&nbsp;|&nbsp;<?php  single_tag_title("", true); } } ?>
    </title>

    <meta http-equiv="Content-Type" content="<?php bloginfo('html_type'); ?>; charset=<?php bloginfo('charset'); ?>" />
    <link rel="stylesheet" type="text/css" href="<?php bloginfo('stylesheet_url'); ?>" media="screen" />
    <link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="<?php if ( get_option('woo_feedburner_url') <> "" ) { echo get_option('woo_feedburner_url'); } else { echo get_bloginfo_rss('rss2_url'); } ?>" />
    <link rel="pingback" href="<?php bloginfo('pingback_url'); ?>" />

    <!--[if IE 6]>
    <script type="text/javascript" src="<?php bloginfo('template_directory'); ?>/includes/js/pngfix.js"></script>
    <script type="text/javascript" src="<?php bloginfo('template_directory'); ?>/includes/js/menu.js"></script>
	<link rel="stylesheet" type="text/css" href="<?php bloginfo('stylesheet_directory'); ?>/ie6.css" media="screen" />
    <![endif]-->

    <?php if ( is_single() ) wp_enqueue_script( 'comment-reply' ); ?>
    <?php wp_head(); ?>