Potential difficulties in trip to Europe? [closed]

Building on this question. I am 18, and an Indian, and am planning to go on a month long trip to Europe (this year or the next, depending on some stuff). I plan to either go alone, or with a friend. I am good at speaking English, so language shouldn't be a problem. The answers to the linked question do provide some useful information, but I would like to know beforehand what could potentially go wrong in the trip (due to my nationality, or not being a 'western' citizen, for that matter). The countries I will be visiting are more or less the same as in the linked question. What additional precautions, if any, would I need to take on the trip?

Additional information: I have a fair amount of experience in travelling, and am used to being independent. I have previously travelled to Sweden, on a student exchange program. I lived there for three weeks. Overall, I loved the atmosphere and the experience in general. I have never been to any other country in Europe before. My primary aim for the trip is to see and explore the culture, the cities, and even smaller towns, if possible, while not rushing from place to place in a hurry. My budget is pretty flexible so that shouldn't really be a problem.