Sig.grumpybanners went down on Friday, meaning my rotating header did not show up. This site was the easiest, no php required, option to adding a rotating header. (ETA: Typically it is now working again)
After more than a day of this I decided to tackle the issue again. I knew it required php but I thought it would be difficult to implement. Turns out it's not that difficult to make a rotating header with a few tools and a user friendly php script, providing you have access to a host site (eg personal webspace).
You will need to upload files, so you'll probably also need to use an FTP client. I'd say these instructions as for intermediate users with some knowledge of website design/maintenance, or beginners who are willing to do a bit of reading and experimenting with the necessary software.
This post is largely for my reference, to remind me how I accomplished this, should I ever need to set it up again. My memory for such things cannot be relied upon! But if you find it useful, I'm happy to have helped.
( Full instructions under the cut )