If you don't know them already you will need to learn some Xpath expressions, but that is a useful thing to know.

xpather.pl can learn you some xpaths

Re: htmltreexpather.pl - xpath helper, creates xpath search strings from html ($VERSION = 20120112 )

Re^2: htmltreexpather.pl - xpather.pl -- creates xpath search strings from html/xml using XML::LibXML

In reply to Re^2: extracting sub elements from DOM by class by Anonymous Monk
in thread extracting sub elements from DOM by class by Discipulus

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