I don't use the module personally but here are a few suggestions..

  1. Any time I download a module, First back up your site and the database, so If you don't like change back to the last version..
  2. there should be a .sql uninstall file in the download..
  3. Just take your time and trace each file that you have uploaded and delete them one by one..
  4. Be careful if one of the .php file loaded over a core file then you will have to replace the originial..