Sort order and limit of child nodes

Questions
1

I have this xlst which gives 4 childnodes of a define parent, the sort order is descending, how do i make it so it gets the last 4 instead of the 1st 6 then stopping?

Like lets say i have 8 pages, it seems to be listing 4,3,2,1 instead of 8,7,6,5...

Thank you!

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE xsl:stylesheet [ <!ENTITY nbsp "&#x00A0;"> ]>
<xsl:stylesheet
    version="1.0"
    xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
    xmlns:msxml="urn:schemas-microsoft-com:xslt"
    xmlns:umbraco.library="urn:umbraco.library" xmlns:Exslt.ExsltCommon="urn:Exslt.ExsltCommon" xmlns:Exslt.ExsltDatesAndTimes="urn:Exslt.ExsltDatesAndTimes" xmlns:Exslt.ExsltMath="urn:Exslt.ExsltMath" xmlns:Exslt.ExsltRegularExpressions="urn:Exslt.ExsltRegularExpressions" xmlns:Exslt.ExsltStrings="urn:Exslt.ExsltStrings" xmlns:Exslt.ExsltSets="urn:Exslt.ExsltSets"
    exclude-result-prefixes="msxml umbraco.library Exslt.ExsltCommon Exslt.ExsltDatesAndTimes Exslt.ExsltMath Exslt.ExsltRegularExpressions Exslt.ExsltStrings Exslt.ExsltSets ">

<xsl:output method="xml" omit-xml-declaration="yes" />

<xsl:param name="currentPage"/>

<!-- Don't change this, but add a 'contentPicker' element to -->
<!-- your macro with an alias named 'source' -->
<xsl:variable name="source" select="1155"/>

<xsl:template match="/">

<!-- The fun starts here -->
<ul>
<xsl:for-each select="umbraco.library:GetXmlNodeById($source)/node [string(data [@alias='umbracoNaviHide']) != '1' and position() &lt; 5]">
            <xsl:sort select="@sortOrder" data-type="number" order="descending" />
    <li>
        <h3><xsl:value-of select="data[@alias= 'date']" /></h3>
        <p>
        <xsl:value-of select="@nodeName"/>
        <a href="{umbraco.library:NiceUrl(@id)}">&nbsp;learn more&nbsp;&gt;                     
        </a>
        </p>   
    </li>
</xsl:for-each>
</ul>

</xsl:template>

</xsl:stylesheet>

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/3873-sort-order-and-limit-of-child-nodes