So you did reserve a copy of Windows 10 using the Windows 10 icon?
Has the download been completed? Check for a hidden system file on the C: drive which starts with $.
Once those things are done, you are just requested to wait for a message, which might not come until later in the day. I don't know is anyone has done a normal Upgrade yet. I think I would stay away from the .iso route. But if you do that, make sure you sign into a Microsoft account at some point.
Go to updates history, does it say that the windows 10 home update has failed? If it does click on it and see what type of error it is. If it is error 80420040 (or something like that) then do the following to see if it helps:
Go to C:/Windows/SoftwareDistrubition/Download and delete all of the files in it.
Then run command prompt and do this command: wuauclt.exe/updatenow
It shouldn't say anything but if it says that isnt a command just remember there are no spaces, captials, and you have to run it as administrator.
Go to Windows Updates and windows 10 should start downloading.