Remove WooCommerce checkout fields is a simple process that can be accomplished by editing the function.php file in your child theme and inserting the following code.
add_filter( 'woocommerce_checkout_fields' , 'remove_woo_checkout_fields' );
function remove_woo_checkout_fields( $fields ) {
// remove billing fields
unset($fields['billing']['billing_first_name']);
unset($fields['billing']['billing_last_name']);
unset($fields['billing']['billing_company']);
unset($fields['billing']['billing_address_1']);
unset($fields['billing']['billing_address_2']);
unset($fields['billing']['billing_city']);
unset($fields['billing']['billing_postcode']);
unset($fields['billing']['billing_country']);
unset($fields['billing']['billing_state']);
unset($fields['billing']['billing_phone']);
//unset($fields['billing']['billing_email']);
// remove shipping fields
unset($fields['shipping']['shipping_city']);
unset($fields['shipping']['shipping_postcode']);
unset($fields['shipping']['shipping_country']);
unset($fields['shipping']['shipping_state']);
unset($fields['shipping']['shipping_first_name']);
unset($fields['shipping']['shipping_last_name']);
unset($fields['shipping']['shipping_company']);
unset($fields['shipping']['shipping_address_1']);
unset($fields['shipping']['shipping_address_2']);
// remove order comment fields
unset($fields['order']['order_comments']);
return $fields;
}