Continuous discovery means an open backlog where everything is considered speculation and hypothesis. Continuous validation means that the user experience is validated for each release, rather than up front. This may sound like big budget to you, but let me give you a case study, about how a single team accomplished it on a tight budget.
A small team with a small budget has the advantage of not losing its head with big ideas from experts in different fields, be it architecture or user experience. The budget constraint sharpens your effort in a way that could be healthy even to a larger team.