The Sabayon team have certainly done a good job with the install process. They are using the Anaconda installer which, I believe, comes from Fedora and it’s an excellent tool. After a short internal debate (do I want to keep the Windows partition, have I ever felt the need to use Windows?) I went with the default options and everything went incredibly smoothly.
Now it’s updating time. There are 365 updates to get through, starting with Entropy.