I just bought a pair and the instructions tell me to remove the original insole. The problem is, the original appears to be glued on in my particular pair of shoes. I could get them out, but it would be a real excavation job, digging it out chunk by chunk as the glue allows or does not allow. I just said f it and placed the new insole on top of the old one. It feels a bit odd as the toeroom has shrunk and the heel is raised noticeably. Should I rip out the old insole as time consuming and aggravating as it might be, or should I try to let the shoe stretch to conform to my foot?