As an experienced user, you'll probably only want to read this manual if you encounter a problem that you don't know how to solve or maybe simply you're interested on how to get the best of phpGraphy. If you're stuck while trying to resolve a problem, consult the Troubleshooting section which give you some baseline on where to look. To get the best part of phpGraphy, briefly read the Table of contents to locate the chapters that might interest you.
First of all, I would suggest you to read the Quick Tour to get a better idea of what you can do with phpGraphy. Then install it using the Installation Procedure and well I think that's about it really for a start :)