You are right to have only a general plan, things change as you go, places can be better or worse than expected and mishaps happen, hopefully not bad ones. My first big trip was the opposite way round, UK to Oz, the plan was to take 4 to 5 months to get there, it took 10 and that was not because of problems, I just took my time and stopped where I wanted to for as long as I wanted.
Enjoy the ride.
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