Reply To: How exactly do I change the size of something in Object mode, like if I only wanted to make a primative smaller from one side, without going into edit mode?

You can change the origin of the object with the 3D cursor. Or you can change the size of the object in the properties panel by taping n on the keyboards. Finally, you can constraint to the x, y or z while doing the transform by typing x, y or z. I hope this is helping!