How can a PHP developer with limited programming knowledge effectively customize an XML RSS feed display script?

To effectively customize an XML RSS feed display script with limited programming knowledge, the developer can focus on modifying the display elements such as colors, fonts, layout, and adding additional information. This can be done by editing the CSS styles and HTML structure within the PHP script to achieve the desired look and feel.

```php
<?php
// Sample PHP script to display an XML RSS feed with custom styling

$feed_url = 'https://example.com/feed.xml';
$xml = simplexml_load_file($feed_url);

echo '<div class="rss-feed">';
foreach ($xml->channel->item as $item) {
    echo '<div class="feed-item">';
    echo '<h2>' . $item->title . '</h2>';
    echo '<p>' . $item->description . '</p>';
    echo '<a href="' . $item->link . '">Read more</a>';
    echo '</div>';
}
echo '</div>';
?>
```

In the code snippet above, the developer can customize the CSS styles for the `.rss-feed` and `.feed-item` classes to change the appearance of the RSS feed display. Additionally, they can modify the HTML structure within the loop to include additional information from the feed items or adjust the layout as needed.