When I got my new insoles my podiatrist advised me to gradually make the switch from wearing my old ones full time to wearing the new ones full time. I didn't! That would mean replacing my entire collection, and I'm terribly bad at shoe shopping. I've now used both pairs in parallel and it works fine. And by now I've managed to buy my second pair of shoes (or rather, boots) that fit them. The first pair concerned a pair of black boots - from Debenhams, where my transformation started. And the next pair I bought together with my mother. So I'm now turning into a lady with size 5!