hey guy, you have done well to have acquired autocad and i will say that you should keep practicing because the more you do the better you become.
as per PDMS, is a software that helps you to mould and design a plant which comprise so many things like pipe design, mechanical equipment, fittings, structure design etc. it is majorly used in oil & gas sector. you cant learn it on your own because is a bit different form autocad but with your autocad experience you have an edge.
if you want to learn PDMS in its totality, then call 08038408095, or mail ander4jesus@yahoo.com, or better still visit our office 4b, johnson str opp airport hotel ikeja lagos. it will take you 15days to acquire this skill and enjoy 10% discount