sure we are almost same age group so i can understand how difficult polishing by hands
well it would be helpful if u share ur car skin pics here for better understanding, well being detailing principles should use least abbrasive products first like i found trutle swirls and secratch remover good for cobwebs, use ornage lc pad on ur porter cable da with speed 5.5 and good massage to ur car skin
if u like i can ref u a very reliable professional detailer belongs to dc team karachi who can do this work for you with rotery polisher with less than half of time compare to da polisher, about da convertor i am sure he can also guide you its sourcing in karachi , sure he is far better than next engeering khi 