It's a shame you have a thing about other people touching your feet, Fiona, because there really is nothing to compare with having a proper pedicure done by a chiropodist/podiatrist. My personal treat is to have one every 6 weeks - she does home visits - and it really is the only thing that keeps the growth of hard skin on mine under control. I'm always amazed at just how much dead skin she literally shaves off with a scalpel each time she does my feet. And I find the massaging bliss!
I first started seeing her on the recommendation of my GP because I was having repeated trouble with ingrowing nails on my big toes. That was sorted by minor surgery but I loved having it all done for me and so I kept up my regular appointments - I've not cut my own toenails in about 10years now
If you can bring yourself even just the once to have a chiropodist/podiatrist they will be able to offer you advice on the best products etc to use to help keep the hard skin soft and also give you advice on how best to try and prevent too much off a build-up. However, our feet do suffer a lot of wear and tear and nothing other than stopping walking around on them will ever stop the build-up of thickened skin and callouses but as I've discovered it can be managed. I've also found her advice on how to be sure that a pair of shoes are fitting properly invaluable - one of her comments was that she thought that I was actually wearing some shoes that were too big and that that can be just as much a problem as wearing shoes that are too small! So goodbye to a favourite pair of mules that had stretched but also goodbye to thickened skin on the balls of my feet every summer. I now only buy sandals with straps that can be adjusted so that my feet are held firmly in place and don't move around in them and flip flops are now definitely for use only around the pool and I don't use them for walking in for any length of time. These sort of things have made a real difference for me and my feet feel so much better now.
SM