Went to rajasthan last summer and I would echo the points above;
Be prepared to get stared at-especially if you are going with a pretty woman, or a pale skinned woman. We had problems with people trying to take pics of my girlfriend while she slept on on overnight train.
Roads are shocking-we were told that the belief is ‘might is right’ therefore lorry drivers, bus drivers etc stop for almost nothing-cows being the notable exception!
We both got sick and really needed the rehydration tablets we had with us-I would say bring a good supply because you might really need them if the food gets you.
Hand sanitizer/wipes etc are also essential! In all the areas we were it was pretty normal for me to go to the toilet where-ever they wanted! Once beside a fruit and veg stall where I was about to buy some stuff…..
Accomodation might be very different from what you are used to-be prepared to rough it some places. But that said it is really cheap on the whole!
Our group either loved it or hated the place-It will blow your mind one way or the other!