Harder materials and larger bits require working at a lower speed.
Do not use machine a without guards supplied.
The power of a cordless drill is proportional to the voltage (approximately), the voltage is also proportional to the weight (approximately).
Tape a penlight to the casing of your drill - you can then see exactly where you are even if it's dark.
MAke sure all tools and equipment are in good condition.
Proper, effective hearing protection should be worn when working with noisy tools such as power hammers and breaking tools.
Secure the workpiece with clamps or a vice, allowing both hands to be free to operate the tool.
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