You always hear about one guy who cleaned up using a 1m strategy, but it's a 99.9999% losing proposition for everyone else. Trading noise is extremely difficult and indicators are no better than a coin flip on the smaller time frames. They're barely any help on the larger time frames.
People who write books about trading are generally just interested in selling you a book. There's always an example of the multi-millionaire who succeeded using the author's system (usually themselves), yet they fail to mention the abysmally poor success rate of everyone else who tries it.
Most at-home, normal, "solo guy in front of a computer" traders make money by keeping their risk small and holding their trades for a long time. Day trading is very difficult, scalping 20-30 successful trades is EXTREMELY difficult.