A Chinese SKS is really no different than any other SKS. The way to field strip it is to lift the small lever at the back of the dust cover and pull out the pin. The dust cover will lift off and the...
See the SKS Instruction Manual (link below). Note that the "exploded view" diagram is small and not easy to read, but the indexed list of parts below the diagram is normal text.
This is purely opinion on my part, but the SKS was created in Russia, and made there for a number of years before the Chinese began manufacture. The Russian SKS tends to have better quality machining...