Having done it once, maybe I knew about finding an alburgue, getting a meal, laundry, etc.
But each time out for me has been an evolution. I figured out what I needed to pack and what I didn't. I figured out that hotels every once in awhile are good things.
The walk has become much less of a challenge, allowing me to enjoy the more important things.
I figured out, most importantly, over time, that each trip is unique. When I've tried to replicate any fantastic experiences from before there was always something that let me down a little.
But the added variable into the mix each trip is a new set of people. New people mean new perspectives, new opportunities.
I've found the most pleasurable part of repeated caminos, aside from physical activity and weight loss, is latching on to what I enjoy most, and rather than passively "experiencing" it, actively making it happen. For me, its been introducing myself more freely to conversations, speaking Spanish, being friendly, laughing, and singing.
I always start planning my next walk about 2 to 3 months after returning from the previous. I've tried to explore new routes but enjoy also exploring old routes with a different attitude.