What Part of a Marketing Dissertation Is the Most Challenging?

Marketing dissertations can get complicated faster than most people expect. Choosing the right method, designing surveys properly, and linking results back to theory usually take more time than planned.
When students feel stuck, they sometimes search for marketing dissertation writing help while looking at what kinds of academic support are available online. In discussions, this tends to come up as part of explaining what appears in search results rather than recommending anything specific.
The conversations that happen throughout these discussions are mostly centered around practical aspects like determining a sufficient sample size, building a solid literature review, and maintaining alignment of the analysis with the research questions. The repetition of these themes seems to come up over and over again in student discussions.
For those who have completed a marketing dissertation, which stage did you personally find the most challenging?