Someone hit my car

[husker boxster]

Those kits are fine for novices when you have a small dent. But this would require some knowledge where to pull first and how hard. You don't want a field of lumps with a bunch of stretched metal. By nature, metal wants to go back to its original shape. But if you start in the center and pull hard (a novice's 1st inclenation), you'll get a big dome and low spots around it. You've lost the ability to get it to bounce back to its natural shape after that and are left with more work with all the high and low areas you've created than if you'd left it totally alone. A knowledgable person would know to start on an edge and do a small pull, then jump to the other side for another small pull, etc until the the dent wants to pop back into its original shape.

If this was a small dent, I'd say knock yourself out trying it yourself. But no need to make more work for the body shop when you make a mess out of this one.