Field access is frequently regarded as a mere practical step in the research process, with insufficient attention given to its broader implications. Numerous writings that focus on gaining field access offer just a collection of practical tips. While these recommendations are valuable, they are specific to each setting and individual experiences. Such an ad hoc approach fosters a limited understanding of the research permit application process and limits the discussion of access by disregarding its inherent uncertainty and its manifold consequences. In authoritarian contexts, obtaining field access remains highly uncertain and can be further complicated by arbitrary decision‐making. This article demonstrates that in Vietnam, social scientists, including anthropologists, must navigate ambiguous processes of trial‐and‐error to secure field access. With the term ‘trial‐and‐error’ we refer to an approach to problem‐solving in which various methods are attempted. Proceeding through trial‐and‐error involves familiarisation, networking, and improvisation. Based on 15 years of experience working in Vietnam we provide evidence that the process of trial‐and‐error is inherent in all three aspects. Beyond the issues surrounding access for foreign researchers, our observations also underscore the pivotal role of trial‐and‐error as a mechanism that Vietnamese citizens employ to navigate the uncertainties and arbitrariness associated with bureaucracy.