Also i dont think that having degree will be some sort of useful in this kind of job - electrician or plumber. If am i right, most of work is done by hand. No rocket science.
No, but both are fairly well paid jobs - most electricians and plumbers earn more than most people with degrees. Unfortunately the value of degrees has been drastically reduced in recent decades, with many people taking them who shouldn't, and many doing completely useless degrees with no job prospects.
Biggest employer of University graduates? - McDonalds!