you are going to have to edit the theme code for the first page. You need to edit header.php and just
after line 42 (version 3..3) which is
HTML Code:
<?php wp_head(); ?>
you will add something like
HTML Code:
<?php if (is_page(35)) {.......}; ?>
as for the css, yes put it in the 'CSS Inserts' option, just prefix the CSS selector with 'body.page-id-35' substituting what the page ID is in place ofthe 35.