Desoldering

There are many ways you can desolder components and it is truly an art in itself. If you are new to desoldering electronics, I would recommend starting with cheaper components. An old broken radio is a perfect training ground as it includes many types of components in different sizes and shapes. There are special materials available for desoldering components, such as solder wicker and suction pens, but personally, I found that the best way to do it is to use a soldering iron and a pair of tweezers to grab and pull the components. How to desolder electronics is hard to illustrate in a book so I recommend having a look at these videos to get a sense of what we are dealing with:

https://www.youtube.com/watch?v=77JgIqraX_I

https://www.youtube.com/watch?v=Z38WsZFmq8E

There is no single way that is the best way, so I would watch as many videos you can in order to get a good grasp on the concept. Then, start training on your own on any kind of electronic junk you might have lying...