Micropipettes are devices that are used to deliver small volumes of liquid; usually in the range of 0.5 to 1,000 microliters. Like other forms of laboratory instrumentation, the micropipette must be operated with precision so that your measurements can be reproduced consistently.
It's not hard; so don't be intimidated by it. But it does take practice. Your technique is very important. And since a micropipette delivers such small volumes, a minor operational flaw could make a huge negative impact on the accuracy of your measurements.