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Step 1
Find the most comfortable grip. Locate the forward/reverse switch with your thumb and side of your index finger. Let the drill hang at your side. Get an idea as to how the drill balances itself in your hand. A firm grip is the key to perfect drilling and comfort while you do it.
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Step 2
When depressing the trigger, notice how the speed of bit rotation increases the further down you press. Get a feel for the difference in speeds, as this will allow you to apply the right pressure to countersink a screw or clear a hole. If there is a clutch or speed adjuster, experiment with it.
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Step 3
When bearing down on the bit, you will probably elect to use your free hand as a guide and to increase pressure. Bear down with the heel of your free hand on the back of the drill, directly behind the bit. If the drill has a side handle, get to know it, and use it.
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Step 4
If you are sinking a screw using an electric drill, make sure the bit is securely embedded in the head of the screw. This will prevent stripping. Continue applying pressure until the screw is completely sunk, then let go of the trigger, then lift up. That way the screw head will remain intact should you ever need to unscrew it.
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Step 5
If you are drilling into masonry or metal, you will need all the power you can get. With both hands, hold the drill at arm's length and bear down with your shoulders directly behind the drill bit. This makes for accurate drilling as well as saves your body some wear and tear.
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Step 6
If your drill has a key chuck, you can prevent losing the key by tying it to the power cord (if the drill is corded). If the drill is cordless, chances are it has a key-less chuck. One trick to using a key-less chuck is to grip the chuck, switch the drill into reverse, and carefully depress the trigger a little. The chuck will loosen immediately. Do the same but with the directional switch in forward to tighten the chuck onto a new bit.
