LED pool lights are easy to install. For most models, there is an installation manual, which is self-explanatory, but poorly made models can be hard to install. Fortunately, you can always go for the easy to install models.
You also need to note that not all LED lights are suitable for all fittings. This is an issue that you should watch out for when making your purchase to ensure that your light will fit your swimming pool. Some units come with a magnet that sticks to the wall while others simply float around your pool.