First of all, I decided to deeply understand the theoretical part of the methods through an individual study moment. Then, I asked my supervisor for some help and suggestions in order to solve the situation and to develop the analysis. My supervisor suggested me to collaborate with a peer, so a colleague from another University with similar competences: it was crucial for me in order to scaffold collaborative moments. We helped each other, we shared competences, ideas and information and we created our coding system to continue the research. After that, for a specific part of analysis, we decide to find a professional advisor, so we engaged an expert in the field, in order to have feedback and practical/technical suggestion. After a first step of analysis, we checked the work with our supervisor: after the check we wrote down the paper and than we activated another feedback and check process. In this way, we created a virtuous network also for future work. 
So if you have a methodological problem, first you can enrich your knowledge, than ask to professionals and expert, share and collaborate with peers and create a network.