The Balltrimmer is an ideal grooming tool for reaching sensitive areas. The Balltrimmer is safe and effective and offers a better alternative to scissors or razors. It's ideal for first time groomers as well as those who are more experienced at the process. Trim as little or as much as you want, whether it is just a touch up or a smooth shave, the Balltrimmer won't nick, cut or chaff sensitive areas.
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.