You can take the bus or subway to any passenger station in Guangzhou (your choice). Then take a bus at the passenger station to Dongguan main station.

Then walk about 30 meters from Dongguan bus terminal to the city bus terminal (bus terminal) and take bus 1 18 (take bus stop 1), bus 77 (take bus stop 3), bus 67 (take bus stop 5) and bus 68. K7 (take bus stop 10) or No.9 bus (John Wan).

If you go directly to Cheng Nan Bus Terminal, take 18 bus (4 stops) or 54 bus (6 stops) to Xinyin Zhongnan Station.

It's not as messy as you think. Just don't go out too late at night. Take good care of valuables at ordinary times.