To use a DeWalt planer, ensure you have safety glasses, earplugs, and a dust mask. Adjust the blade depth and speed for the desired cut. Feed the wood into the planer with uniform pressure, keeping it parallel to the table. Use jigs or fences for precise cuts. Monitor blade sharpness and lubricate it regularly. In case of any issues, consult the manual and troubleshoot accordingly. For optimal results, consider using a planer stand and dust collection system.