A drill press is highly recommended, but not entirely necessary. If you use carbide bits, be prepared to break a lot of bits unless you have a very good press and a good eye for drilling. The advantage of carbide bits over steel bits is that the carbide bits will last a lot longer before get dull and unusable. We use steel bits, they wear out faster, maybe only 200 or 300 holes per bit, but they don’t break as often as carbide, so they can be more economical. We’ve used .034″ and #66 size bits. Make sure the chuck on your drill will clamp down small enough to hold on to the bit. The steel bits were too small for the chuck on some dremel tool chucks, so be aware of that and check the drill you plan to use.