Use a spot weld drill and a spot weld spring center punch no Hammer needed. I take everything apart so every piece can be reused. Here I completely dismantled a front fender and reassembled it .
After you center punch the spot welds you use this spot weld cutter. They have one with a small pilot drill bit or one with a spring loaded pointed pin.
I like and use the springed pin style. Due to not having a hole through both pieces so you can save a panel if you want to spot weld it instead if mig welding.
They are made by Blair. you can buy them at advanced auto parts. I included a link below. They work great. The spring center punch lets you center punch on the lightest metal and on pieces that are flimsy without destroying it with a hammer.