The question you asked is very vague. The dent has to be kind of examined. I try to pull them out the opposite way they were put in. This will lead to less stretched metal. If it requires a hammer to fix it, the softer the blow the better. I lightly tap the metal many times, probably 80 times per minute. Those hits are way better than one hard hit. if the dent is accesible from the back of the panel and it isn't hard to get to, see if you can push it out by hand. Then again, your question wasn't very clear, so I can't help too much. Anyone can do bodywork, as long as they take thier time.