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Although it is not so popular these days, a while ago there were a lot of "Amateur Radio Enthusiasts", most of whom were not professional Radio, Electronics or Electrical Engineers.
To get their Amateur Radio licences, they had (and may still have) to pass a fairly demanding set of tests covering technical aspects of electrical, electronic, and radio engineering;
..... as well as a significant range of Statutory Regulations governing the legal implications of using radio communication equipment, and some aspects of practical use of such equipment.
Some Amateur Radio enthusiasts whose ordinary "day-jobs" were nothing whatsoever to do with electrical, electronic, or radio engineering: (e.g. plumbers; builders; primary school teachers; etc.) were ACTUALLY just as technically AND practically competent in their knowledge of electrical, electronic and radio engineering as many full time professional engineers;
..... and they often had much more practical experience and practical ability than a typical newly qualified engineer.
Much of what is considered to be important in electrical engineering was discovered by Michael Faraday, who was himself essentially an enthusiastic amateur with little formal education, and few people around who could teach him anything about the newly emerging field of electrical engineering.
Faraday is still considered to be one of the most influential figures in Electrical Engineering, and he was almost entirely self-taught in his field of study.
If Faraday could do it then, so could you (or almost anyone else) now, if you put your mind to it.
You would however, be severely restricted in the electrical "work" that you would be allowed to do (e.g. even just for friends) unless you became qualified in such things as "electrical installation", which is governed by many strict regulations.