Jacking a car is stupidly simple, jack it on any strong part, ie the sills, sub frame bolts, wishbones, rear beam etc etc... basically you can pretty much tell by how much weight is already on it, eg the subframe holds the steering rack, engine mounts etc so can obviously take alot of weight and the sills are where a garage will jack it, we used rubber blocks on flat ramps on each corner using the sills.