That 99% of the people on the forum who are using neat looking toys, are using them because they make life easier, and not just because they look neat. (ok I just made up 99% but you know what I mean)
Contrary to the first tip, the more you add to your system, the more you have to clean.
Experimentation will often rend poor results. Success is an exception, not an expectation.
You can never have too many pots, coolers, or buckets.
Propane is not cheap.
Brewing is not hard despite how many books, threads, videos, and opinions there are.
You will never stop accumulating homebrewing supplies
ever.
You will drink more beer than ever.