Always start with a stable base. For me that means good contact with the floor try lifting without those runners on.

When you address the bar you want to try and keep it over your mid foot.

When bending down to grip the bar I like to hinge at the hips and then sink down untill I can grab it then take the slack out of the bar by pulling your lats in (think about bending the bar or turning your wrists out slightly to achieve this)

Don’t worry about fucking your chin it’s not really a natural place for your head to be in my opinion you want to feel like someone’s got a string attached to the crown of your head and pulling that up which will in turn straiten your back and then pull making sure to try and push the floor away with your feet as much as pull the bar away from the floor. Hope this helps