• To be comfortable squatting, bench pressing, and deadlifting with good (not necessarily perfect) form
• To have used a linear program like 5x5 or Stronglifts, and stuck with that until it stopped working for you
• To have access to a barbell, chin-up bar, and plenty of weights

On that note, if you feel that you're a little past the benchmarks above, and flirting with intermediate advanced status, you might want to check out the full Unfuck Your Program course. While it covers some beginner-level topics, it's mostly aimed at helping you progress to and through the advanced level so that you can start pushing elite status.