Hiya i did for a year and a half and looking back i don't know how i did it! Alot of my clients are local so I had to carry everything like a packhorse, or get a taxi or a lift to one village and try and stay there all day goig from different houses. And not forget anything!
Having a car is a massive bonus you can fit more people in, go further and carry everything u need.
I wouldn't recommended doing it without, but it can be done if u have no choice and work hard x