You could try your vet. At the practice I go to they charge a small fee for nail clipping rather than a full consultation fee.
I don't think you're being paranoid about Darcey's nails. When my first Cocker was very old his nails started to thicken and get long. I couldn't trim them properly myself so one of the vet nurses used to do them, but I had to monitor when they needed doing or he would start walking badly.