Set the barbell at shoulder height, grip it slightly wider than shoulder-width, position your elbows under the barbell, and lift the barbell. Stand upright, keeping your neck slightly pulled back so that the barbell can pass. The barbell should be vertical to your elbows. Instead of using your lower back, engage your hips strongly to use your hip joints. Think of moving only your arms in a straight line. After the barbell passes your head, slightly move your head forward to maintain balance (not too much). When lowering, reverse the process, engaging your hips and hip joints strongly. Your lower back should not be strained. Coaching is possible.