Always Use A Kitchen Scale
Accuracy is the key in baking. Unlike cooking where you can eyeball almost all ingredients and adjust the taste as you go, with baking you have to nail the proportions as much as possible. To do that, having a kitchen scale helps a lot. While measuring cups offer some precision, it's easy to pack too much flour, baking powder, or baking soda in them thus adding more to the dough than what is originally needed. Plus, cleaning is so much easier when using a kitchen scale as you'll only need a bowl or two to mix the ingredients in!