Myra, no need for apologies, I am happy to contribute.

Inversion therapy takes some getting used to and when you first start, it feels as if your brain is going to extrude through you eye sockets and your eye-balls are on the verge of popping out trying to hold it all in! Ok slight exaggeration :)

It is recommended that you start out with only a few minutes and gradually build up to a total of 20min continuous hanging. It is so many years back since I started this, that I cannot recall the exact protocol but the table will come with instructions. I cannot speak with any authority outside my experience but my personal preference is to hanging completely at 180o. It may well be that the 140o of the table is perfectly acceptable as a therapy and may indeed be more comfortable for most people.

Trinity, I love yoga and have recently restarted. The head-stand has many similar benefits to inversion although I don't believe that one gets the decompression of the spinal column but the swing would certainly be amazing.

Warm regards,
Kelvin