Importing your Goodreads books into LibraryThing is quick and easy.
Go to Goodreads My Books > Import page. If you are not signed in, sign in and try it again.
Click on "Export Books" on the top right of the page.
Wait until Goodreads finishes generating your export. Then click the "Your export" link to download it to your computer.
Select the downloaded file and click "Import Books" to import it.