I'm sure you can find tutorials on youtube if you look. But some quick tips on how to use one:
1. You can section your hair starting with the lower layers, thene the back sections, or just work in sections moving away from your face. Use smaller sections of hair if you want the smaller more defined perm-like curls, and larger sections for looser wavier curls. A good rule is pick sections that are about the width of the barrel you are using.
2. Wrap hair around the barrel starting at the base with your fingers holding the end of your hair, and hold the hair until the desired amount of time on the barrel has passed.
3. Remember that near your face the most flattering curls turn out and away from your face. The easiest way to do this is to pull your hair towards the mirror you are looking at ( should be straight out from your face). Place the barrel on top and angled slightly down towards the shoulder on the same side as the section of hair.
4. Hold the curl dependant on how tight you would like it. Obviously beach waves you would hold shortly, while updo like curls will require more time on the iron. (Try not to hold you hair in place longer than 20 seconds, as you do not want to damage it, and shouldn't need more than 10 seconds with quality irons unless it is very thik and unmanigeable).
You will still need to use a heat protecting product before use, and will need hair completely dry as with traditional irons. Apply a type of setting product (finishing gloss, or hairspray) if you wish to add more hold or shine. If you aren't sure wether you will like this kind of curling iron, practice with your traditional clip kind. Just do not clip your hair, keep the clip down, and wrap starting at the base like I stated. The main difference between the two is really preference. It is much easier to creat carefree kinkless curls with this type of barrel, and you are less likely to burn your hair with this, fingers though... ;)

Yes, you are welcome to make a return or exchange if you are not satisfied with the item.

I've had mine for a year, I use it almost every single day, and it still works great!

I saw it in my local Sephora last week. It's not that big of a store, so yours might have it.

Yes. I've seen it in Winnipeg

According to the pamphlet that came with the set, it doses have dual voltage.

You should probably call before heading to the store, but I did purchase mine in-store. I also live in a smaller market area and there were about 4 sets in stock, which surprised me.

This set contains:
- Curling wand (140°-430°F digital adjustable temperature with auto shut off)
- 0.70-1 inch barrel
- 0.75 inch barrel
- 1 inch barrel
- 1.25 inch barrel
- Heat-resistant glove

No, I do not believe so. You must purchase a converter.

i haven't measured but about the same as other typical curling irons. i would guess 1/2 inch, 1 inch, and 2 inch. there are two different 1/2 inch one is the same diameter top to bottom and the other gets wider towards the bottom for a more natural looking progressive curl