The wrong tools for the job can cause more damage than help if you aren’t careful. When working on sheet metal a wrong swing of a hammer, the wrong hammer and dolly can cause damage to your panel that will take 3-4 times as long to fix. You ALWAYS want to match your hammer face and dolly to the shape of the panel your working on. If you’re working on a flat panel this isn’t ever a panel, but as soon as you get into a corner, a curve, or a hard-to-reach area you may need to go outside your simple starter kit of hammers and dollies.