Lower control arm bolts

I would recommend supporting the car by the chassis when loosening any suspension component hardware. Any of the "what if" scenarios will play out better if you're just dealing with the weight of the suspension loading the bolt versus the entire front weight of the car. Safety first.

As far as the anti-roll bar bushings, you're okay to loosen those as long as both sides of the suspension are equally weighted. Either both at full extension or both loaded. If the suspension is loaded unequally the anti-roll bar will have stored energy and will snap back to its at rest position once a bracket or endlink is unbolted.