You have a bunch of things to work on here:
1) Those shoes aren't doing you any favors. Buy a pair of lifting shoes.
2) As you descend, yes you need to break your hips and knees at the same time. Get your knees forward sooner.
3) Resist the urge to pull your chest up/arch your back as you descend. Tight abs when you start and keep your back flat.
4) About halfway down, your knees don't go forward anymore. Be prepared to then just reach back with your butt.
5) Keep your head down the entire time looking at a spot on the ground about 5' in front of you. Drive up with your butt, don't pull up with your head on the way up.