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These are both difficult and challenging jobs. Neither one is easier than the other one, they are just different jobs.
a plumber
Electrician and plumber
plumber carpenter electrician chef mechanic doctor housekeeper
It depends on the type of machine. It could be a handyman, mechanic, electrician, plumber, engineer etc.
There is no gender limitation on being an electrician.
You will have to check you local codes. Sometimes if an outside plumber or electrician is involved they will have to pull a permit.
plumber carpenter doctor housekeeper chef mechanic electrician
Busboy, cook, waiter, plumber, electrician, musician ... just about anything except volunteer work.
A trade school typically has instructors who are certified (if not also licensed) in the trades being taught (electrician, plumber, beautician, etc), or at the very least experienced in those trades if there is no pertinent certification in that industry.
house keeper, mechanic, plumber, carpenter, doctor, chef, electrician