Firstly all e-cigarettes work in the same basic way. No matter how big or sophisticated looking a device is, they all work in the same simple way. And no, you shouldn't be afraid of them as they are simple to use, especially starter kits.
I am not going to delve into the differences of different kits here, this blog is about the simplicity of how an e-cigarette works. So for the purpose of this I am going to use an Aspire Pockex as the example. The reason I am using the Pockex is that it is a very popular starter kit.
As you can see from this diagram the e-cigarette is basically a battery that has a tank on top. The rechargeable battery has a fire button for activation and that is all. No other buttons or settings needed. The U-tech coil sits on top of the battery and connects to it. The coil is stuffed full of cotton and holds the e-liquid ready for you to inhale it. The rest of the diagram bits are to hold the e-liquid in place. So when you press the fire button, that activates the battery which heats up the coil. That generated heat vaporises the e-liquid that is held in the cotton and you simply take a draw.
So in this example the coil is cylindrical, however coils can come is all sorts of shapes and sizes, but they all work exactly the same way.
All e-cigarettes work in exactly the same way from pen style kits up to the most powerful mods. For a beginner a kit like the one above is easy to use and simple to take apart and put back together so this type of kit is great for a beginner. The coil above is another example of one, so while similar to the Pockex coil is still different but the same rules apply it does need to be changed on a regular basis.
Here is a video tutorial on the very subject of this blog:
So in summary, no there is no need to be afraid of e-cigarettes they are very simple devices.