Here are a few links about nutch related things:

1. Install Java
2. Get ant http://ant.apache.org/
3. Get Nutch running with Jetty http://wiki.apache.org/nutch/GettingNutchunningWithJetty
4. Configure Nutch http://peterpuwang.googlepages.com/NutchGuideForDummies.htm
5. Integrate it with your browser http://www.microsoft.com/windows/ie/searchguide/en-en/default.mspx and http://godbit.com/article/build-a-search-box-for-firefox-2ie7