The gap between planning a budget trip and actually executing it comes down to managing uncertainty, and experienced travelers handle uncertainty differently than beginners.

What beginners do with uncertainty: try to eliminate it entirely. They book every night of accommodation before they leave, plan every travel day, research every restaurant, and create an itinerary that has no flexibility. This eliminates stress in the planning phase and creates stress in execution when the planned restaurant is closed, the booked accommodation turns out to be a bad fit, and the planned transport doesn't run on the day they booked.

What experienced travelers do with uncertainty: accept it as structural. Book the first 1-2 nights in each new country to remove arrival anxiety. Leave the rest open. Make transport decisions 1-3 days ahead when you have current information. Have a direction but not a fixed itinerary.

The specific uncertainty that does require advance planning: transport bookings that have limited capacity (Indian overnight trains, overnight buses in peak season), accommodation in peak season cities with limited hostel supply (Dubrovnik in July, Hội An during lantern festival), and any booking with significant non-refundable costs (major excursions, multi-day tours).

The uncertainty that doesn't require advance planning: where to eat (ask at the hostel), which activities to do (figure out on arrival), which neighborhood to base in (research or ask other travelers). These decisions are better with current information than with 3-month-old research.