Infact it's not a difficult job. Google Earth has made it easier for mappers. The only thing that's a problem now, is you have to find someone with enough time to grid everything and get the proper street names.
For a city where a street goes by with 5 different names...thats the hardest part :-).
If someone's willing to spend a few hard months making it, it's not a hard job - just a time consuimg one. But, if successful, the rewards will be $$$. Imagine all the cars with nav systems but no nav. You can easily sell it to them for 5,000 + rupees.