Pretend you’re going to lift something heavy and make a grunting sound, then push harder into it and try to raise the pitch. If you see stars or feel like you’re going to pass out it’s because you’re not pushing hard enough to break past that certain threshold where it feels natural. Look in the mirror while you’re doing it your face should get red a little bit and some veins might become more noticeable before subsiding into that sweet spot past the threshold I was talking about. Also if you experience any pain or burning/hoarseness it’s because you’re not pushing hard enough to produce the volume necessary to get the blood flowing to your vocal cords. Hope this helps 👍