You're going to get the most out of your camera if you start to learn some basic stuff. Cause although these are great cameras, they definitely need some help from us (quite a bit, actually; that's true of any dSLR). Learning a little will go a really long way. I'm going to suggest you start with a book called The Kodak Most Basic Book of Digital Photograpy, and read it cover to cover. It'll help a lot. Then you can begin to branch out a bit. There are other books to read after that first one, and most people here buy Understanding Exposure by Bryan Peterson. He also has other books in the series that are awesome, like Understanding Shutter Speed, and others that I can't name right now. Check
Amazon to see them all.
Taking good fireworks involves using a slow shutter speed. That means any movement with the camera while the shutter's open will cause blur - even with Image Stabilization. Handholding the camera you might get a few decent ones if you stay really, really still. But a tripod will yield best results by far. The two second timer (along with the tripod) helps keep the camera still also, because when you depress the shutter, it causes the camera to shake a bit, too. On the top left corner is the timer. Press the button and it will bring the timer screen up. Set it to two seconds. Then, when your camera is on the tripod and you hear the firework go up, press the button, and hopefully in two seconds you'll have the "burst" of the firework and you'll be able to capture it. (Another thing you'll want to invest in at some point is a wireless shutter release and then you don't have to use the timer - you can just hit the button and it'll take the shot wirelessly so as not to shake; but I assume you don't have one of those yet so the timer works fine.)
Challenges include missing the burst, and being off on your aim. I took about a hundred fireworks pics on July 4th and was able to get just a handful of ones like above. It's kind of a crapshoot, but a fun and challenging one.
I used a full tripod for these, which made it a little easier, but many people don't want to carry a full tripod around Disney (including me). Other options are a smaller tripod (which would need something stable like trashcan to lean on) or a gorillapod, which can be wrapped around a pole or fence. These fit in a (large) camera bag.
I think somewhere around the Photog Board there are threads specific to fireworks. Not sure where they are as I'm not a huge fireworks person, but either a search, or asking, I'm sure someone will know.
I don't know if you've seen
The Learning Curve thread but that might be helpful to you.
Remember, in Disney, a lot of your pictures will be in low light. Many users here on the PB have invested in lenses which work well in low light (because they have a large aperture, like f/1.8 or so, and therefore are able to let more light in). The kit lenses you have are somewhat limited in low light (as they don't open that wide; however in normal light they are excellent lenses). So a tripod, even a small one, will help with those shots, as will using Aperture Priority (A) and scrolling to the largest aperture available, ie smallest number. (You will also need to raise the ISO, but only as far as you NEED to because too far up can overexpose and/or make the pics noisy/grainy.) If you study this a little before your trip, there'll be less disappointment if they don't come out quite right and you're wondering why.
Hope it's not TMI. If you have questions, everyone here, both on this thread and on the PB, is pretty helpful. I'll also post my
Trip Report thread in case there's anything helpful in there for you.
Linda
(I haven't taken it off my camera, LOL.) Hopefully I'll have something worthy of posting on the Assignment thread. 
Insane!!
). I love the shallow DOF, the color rendition with the lens is really nice and I just find that the pictures have a different "feel" straight out of the camera without any PP. It seems that no matter which version, all Sigma fast prime lenses end up getting 
