They get into the "nerve" of the system only looking for that big, mysterious, slap-your-forehead, jaw-dropping "secret" which will suddenly unlock the mysteries of the Forex world and make them Master and Commander of every Forex pair. All too often, they find themselves entirely let down or the "nerve" reveal something they'd already heard about (but had not experienced). Amateur traders will then dismiss the method as 'too simple'.
Or, the amateur trader will look for that complicated formula, cryptic mixture of indicators and all too frequently what they in reality encounter is a set of simple indicators working together in an unusual way, and they say, "Well I could have done that!" -- and they become disillusioned or annoyed, because they wrongly assume that any technique MUST BE complex, it can't possible be Straightforward! So, they shelve the method or return it and complain that it's "not complex" enough.
This is a serious mistake - because the amateur trader will then repeat this error technique after system and they will never take the time to study and understand the full process of trading.
Don't make this mistake. Understand that most trading methods out there are not complicated. They weave a smaller set of rules together in a simple manner (simple enough that anybody can apply them) but apply them in an uncommon way. Complex systems are for computer geeks and big banks -- if you can't understand something, you can't possibly apply it.
Never skip ahead when learning a powerful new method for trading Forex. Make certain you learn the setup, entry and exit rules (which should exist); that you learn how to protect your trade with stops; and that you study how to apply your system on a timely basis (be it hourly, daily or weekly) to get the most out of the technique and to study how all facets of what you learn work cooperatively to make you a better trader.
Remember, Simple but powerful -- using just a few indicators or rules applied in a non-textbook approach -- is the key to getting an edge in the markets.