I love Indian food so naturally I made a few attempts to cook it all from the raw ingredients. No, thank you

Yep, It's often a full time job for a single dish and surely it takes some experience too. Such simple thing like garlic-ginger paste, I remember what a disaster it turned to. It seemed the taste was acceptable by the texture affected the whole dish - probably ginger was too old.
Or another seemingly simple component: Paneer. In principle you add something like lemon juice to cow milk, drain it, press it and it never feels and tastes the same.
So now, I rather buy the ginger paste, paneer, GM and such. Marinating over night is not a problem, but sort of challenging is buying the right stuff, spices for example. For example, I can buy Cumin Seeds in a chain supermarket or Jeera in an Indian store. Is it actually the sames stuff? And the quality could be very very different so one has to know what to buy and from what place.