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I have 2 rear fenders on my beetle that look like someone used a ball peen hammer on them to remove dents. What tool/tools do I need to do it right myself?

you can buy a cheap body work hammer kit from Harborfreight.com or most autoparts stores,
Body takes alot of practice, you can also use a couple of big machine hammers and hold one on outside while you tap gently with other hammer,
better to go get a couple of good fenders than to spend much time with multiple dents

If the dents are sunkin like hail damage wait for a relly hot sunny day then put dry ice in a rag and place over the dent it works sometimes.