It's not legal for non-vets to give rabies shots here, so I've never given rabies, but I regularly give the 7-Way Canine to my dogs, and that's simple enough. Stick the needle in the liquid bottle and draw out all liquid, inject in the solid bottle. Remove needle, shake the bottle vigorously. Stick needle in and draw out all the liquid. Grasp a loose fold of skin (I usually do it on the dog's back, just behind his shoulder blade.), Stick the needle in the loose fold of skin, making sure it's all the way through the skin layer, inject and remove the needle.
IF you are willing & obedient , you shall eat the good of the land: But if you refuse & rebel, You shall be devoured with the sword: for the mouth of the LORD hath spoken it. Isaiah 1:19, 20