Замена тегов в HtmlAgility

I'm trying to replace all of my h1 tags with h2 tags and I'm using HtmlAgility pack.

I did this:

var headers = doc.DocumentNode.SelectNodes("//h1");
if (headers != null)
{
    foreach (HtmlNode item in headers)
    {
        //item.Replace??
    }
}

and i got stuck there. I've tried this:

var headers = doc.DocumentNode.SelectNodes("//h1");
if (headers != null)
{
    foreach (HtmlNode item in headers)
    {
        HtmlNode newNode = new HtmlNode(HtmlNodeType.Element, doc, item.StreamPosition);
        newNode.InnerHtml = item.InnerHtml;
        // newNode suppose to set to h2
        item.ParentNode.ReplaceChild(newNode, item);
    }
}

problem there is that i have no idea how to create a new h2, get all the attributes etc. i'm sure theres a simple way to do that, any ideas?