I would like to allow visitors to a site to search for posts based on various attributes (categories, tags, custom fields).
I have tried using Solr, but this doesn't appear to work.
I tried using the MySolrServer plugins for a local instance of Solr and a hosted instance, but the plugin doesn't appear to work.
I also tried using Solr for Wordpress, but the plugin wouldn't enable.
I don't want to use something like Taxonomy Drill-down.
Bearing those points in mind, how can I now try to implement true faceted search that will enable site visitors to search for posts based on attributes?

Search comments, tags, categories and custom fields.. It also provides more relevant results. – Christine Cooper Apr 21 at 19:41