I'm in China right now and reflexology is HUGE here. I've gone several times to different places in the last couple weeks and the general rule seems to be, if it hurts when you push a spot, you need to have the spot pushed! lol

The first place I went to literally hat me yelling and pounding the side of the table, but after going 2 more times I was much more able to handle pressure in those areas.

In conclusion, I get the impression you don't really need a chart to do reflexology. Just start pushing spots on your foot till you find a tender one!