My son was 2 when I had my daughter, of course I also have the help of a maid, but I think it is ok, I enrolled my son to join nursery school, so we'll be free for half day, I mainly took care of my girl myself when she was born, feeding, bathing, changing diapers etc. while my maid took care of my son and the cleaning and cooking.
Next year my son goes to K2 and my daughter will join nursery too, so I think it is better not to wait too long to have your second child, they both can be at the school together and play together less generation gap......it will be hard work the first few years!