If you WANT to learn some basic HTML and XML scripting... then go ahead and buy right now and start playing with it... The included samples, existing documentation and users here can help get you going.
There is at least one gui in plans...
http://www.autopano.net/forum/t5015-announcing-autopano-tour ... the next APP release is to include a gui.
I don't think you have to be an expert to use it without a gui though... if you could say you are moderately comfortable doing basic html... then this shouldn't be too difficult at all... and I believe the krpano xml nomenclature to be pretty intuitive.
You can always download the demo version and play with it on your local computer to get the first hand knowledge.
http://www.krpano.com/download/