This paper outlines an ongoing effort to create the first treebank for Occitan, a low-resourced regional language spoken mainly in the south of France. We briefly present the global context of the project and report on its current status. We adopt the Universal Dependencies framework for corpus annotation. Our methodology is based on two main principles. Firstly, we rely on pre-processing using existing tools (taggers and parsers) to facilitate the work of human annotators, mainly through a delexicalized cross-lingual parsing approach. Secondly, we use agile annotation to ensure annotation quality. We present the results available at this point: annotation guidelines and an initial corpus annotated with PoS tags, lemmas and syntactic dependencies.