Excellent question. Someone with a license is usually the way to go. The code test is pretty tough most places. Depending on where you live, word of mouth. Angie's List may be a good place to start. In more populated areas, union electricians are usually pretty good. If using a union electrician, the hall would know if the electrician has experience with the type of work you need. A lot of people can call themselves something but a union electrician has had approximately 4 years of school and OJT before they get the title Journeyman. That still doesn't mean a whole lot. Skilled trades are funny animals. Electricity is a huge field and there isn't anyone that can know it all. Sometimes plumbers can make good pipefitters and vice versa. A welder can be a blacksmith but usually not. Some millwrights are good at vibration analysis but others only know how to align machinery. Carpentry breaks down into rough, finish and cabinetry. Painters and glaziers are just that. (no offense) The sheet metal trade takes years to become a true technician AND artist....
? for chicken canoe-- how do you know if the electrician is a "good" one?
In electricity there's basically power generation, power distribution, residential, commercial and industrial among others. Then there's high voltage (usually >1000VAC), low voltage (50-1000V) and extra low voltage, which includes signal voltage. Most people that know one don't know the others. Some may only be licensed to do fire protection or closed circuit TV.
ETA
This is all just my opinion.
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