Neodymium magnets are the strongest of the permanent rare-earth magnets. For the magnetic strength it packs, it is relatively light. It has wide commercial uses such as in electric motors, magnetic resonance imaging, speakers and headphones, and in computer hard disks. To get more details about rare earth magnets you may check here https://www.rochestermagnet.com/rare-earth-magnets/neodymium-magnets.
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It is also gaining popularity in other magnet applications that have never been used before, such as in the closing mechanism of goods such as jewelry and parachute equipment, and even in children's toys. It is commercially available for do-it-yourself enthusiasts.
This leads to whether it can be drilled or machined by a non-professional or not. While the possibility is there, it is not recommended for several reasons.
The reason for not drill or machine
If you are a do-it-yourself person avid and have an interest in working with neodymium magnets, magnets purchases that have been cut to the size you need. If you need a hole bored into them, have it done by professionals.
You can also order a neodymium magnet by certain specifications. You may only cause damage to the magnets or even injury to yourself if you do not have the expertise and they do their drilling or machining.
The first reason why you do not even have to attempt drilling or the machine itself is a magnet for Nd-Fe-B sintered magnets to behave like a ceramic. This means that they may be hard but brittle because of their fragility.
They have a tendency to crack and chip when drilled. You will only be wasting your money not only have a professional do it for you.