Injection site rotation tips for daily sermorelin

Doing daily subcutaneous shots and I want to avoid irritating the same spot. My nurse suggested rotating across the lower abdomen in a grid, staying a couple inches away from the navel, and alternating sides each day.

What rotation pattern works for you? Any tricks for keeping the injections painless? I've found pinching the skin, going slow, and letting the solution reach room temperature first all help a lot.