Hi Rob M,
Although I don't have an old razor I swapped to this method of shaving a couple of years ago following a real wet shave whilst on holiday and reading articles on the web. As a result I purchased a cheap razor from Boots and started practicing. A few cuts later and I was hooked - better longer lasting shaves and much cheaper - double edged blades are a fraction of the cost of Mach 3 or Fusion blades, and can be recycled too! I was given a much more substantial (and expensive) razor for Christmas which was sourced from the internet where there are numerous sites to equip you. I hope this helps and good luck.