Go to your local tool shop and buy a Dent Puller. It's a big 'sucker' which will pull out any dent where the panel isn't actually creased. It even repairs the damage done by errant sheep after you hit them at 5omph!!!
Don't ask me how I know!
A word of caution though, don't get over enthusiastic as you'll end up with a sucker shaped dome on your panel!!!!!!!
If this helps; you can get a dent out if you drill small hole through (say 4mm) and then screw in a self tapper, leaving head proud so you can grip-n-pull. ok, you then have a small hole to fill but this is usually a bit better. Don't drill through if you think there might be wiring behind!
I purchased a product I'd not seen before the other day just in case. It is a bandage type thing that you cut to shape and moud into the dent / rusted out bit. It sticks like ****** and goes hard with UV light (Sunlight if you're lucky). Takes up to 2 hours if car is outside (and it's daytime!). Anyone used this?
Halfords do a dent puller kit which is supposed to be the 'professional system'' (glue a strap to centre of dent then pull out). Personally i have my doubts, but it might be worth a try.
Depending on age of car I would either pay a body shop to take dent out, (some **** put a dent in wifes car with big suitcase, cost £250 to make like new), or I would leave alone. Every time I've tried to spray a lacquor finish car it looks rubbish
When i went to look at my car before i bought it, i discovered that it had quite a few small dents in it (all of them on the side....you'd think opening a door in a carpark was such a a simple thing!) ranging from the size a a 5 pence coin to the size of a small bank note.
There was even what looked like a small vertical 'crease' right at the leading edge of a rear door, like it had been pushed towards the A-Pillar.
Said dealer got a bloke in with his rods and bars.....ALL DENTS GONE except for the crease, which looks a hell of a lot better than it did.
I don't know who he used but i have seen ads for such services in Yellow pages, if any of them are half as good as the bloke who did mine it'll look as good as new!