Just curious, is it ok to take off these bolts/screw? I mean will anything fall/slip out of align if I took it off too install the H-brace?
Those are the subframe bolts. IIRC there are about 9 bolts holding the subframe onto the car. You're not going to lose anything. The other bolts are for the rear bushings on the front control arms. They're not going anywhere, either.