The short answer
Sometimes, if your LDL is only a little high and your risk is low. Most people lower LDL by 10 to 30%, which may not reach their goal.
Try hard either way: the same changes help blood pressure, blood sugar and weight. If you start medicine, healthy habits make it work better.
Source: NCEP ATP III, Circulation 2002; 2018 AHA/ACC cholesterol guideline.