If you need help with Nokogiri, here are some people and places that will prove invaluable.
The following are the sites you can refer:
Homepage and documentation: http://nokogiri.org
Source code: https://github.com/sparklemotion/nokogiri/
The top five Nokogiri resources are as follows:
Nokogiri History, Present, and Future presentation slides from Nokogiri co-author Mike Dalessio: http://bit.ly/nokogiri-goruco-2013
In-depth tutorial covering Ruby, Nokogiri, Sinatra, and Heroku complete with 90 minute behind-the-scenes screencast written by me: http://hunterpowers.com/data-scraping-and-more-with-ruby-nokogiri-sinatra-and-heroku
RailsCasts episode 190: Screen Scraping with Nokogiri – an excellent Nokogiri quick start video: http://railscasts.com/episodes/190-screen-scraping-with-nokogiri
Mechanize – an excellent Mechanize quick start video: http://railscasts.com/episodes/191-mechanize RailsCasts episode 191
Nokogiri co-author Mike Dalessio's blog: http://blog.flavorjon.es
The community sites are as follows: