(Wellington Somerset UK)
I notice that you don't mention protection whilst dowsing. As I am sure you are aware, we are opening up ourselves to all kinds of influences whilst dowsing or even simple meditation and it is vital to protect ourselves from anything untoward or unwanted intrusion.
I think it would be beneficial if you could introduce a simple protection method into your instructions , i.e. ask your spirit guides to keep you safe or if they are unknown ( particularly to a beginner) ask the ultimate protector, "Archangel Michael please keep me safe from intrusion from unwanted or malevolent forces whilst dowsing with my pendulum or during meditation".
I don't wish to encroach on your teaching and obvious good intentions. But this is so important and is often overlooked. It only takes a few seconds to stay safe.
Kind regards and thank you for you informative website.