I've got a 2016 MBP and will want to do a complete fresh install of High Sierra when it comes out on the 25th. I'll take everything I need off the Mac prior to installing High Sierra. My question is how can I install it completely fresh? Will I have to go through the method of holding cmd-r on restart, erasing the SSD and installing High Sierra (I don't know if thats possible as I thought that it only reinstalls the OS edition that came with the Mac which is Sierra in my case). Or, when downloading from iTunes, will it give me the option of a completely fresh install? Also, I am aware of having to sign out of iCloud, iMessages and iTunes. Will that then automatically delete my Mac off my iCloud account, ready to re-add it when I fresh install High Sierra? Thank you.