I'm learning Hindi and there are somethings that are easy (phonetic alphabet, nothing like 7 different sounds for 'ough') but the sentence structure is very different and can be hard to get right. Pronunciation isn't too bad for the most part but there a few tricky things, for example four different 't' sounds and four different 'd' sounds. The hardest part is that there really aren't that many resources. Even though Hindi is the third most spoken language in the world, you will find far more resources for many of the less spoken European languages.