It's really easy so long as you a) start at level 1 or 2 and avoid building out too far ahead, b) build to a character concept rather than try to optimize mechanically, c) avoid options released in adventures. Oh, and d), understand that retraining is actually baked into the rules.

Adventure character content is less rigorously tested, and mostly amounts to professional homebrew. It's often super focused on the scenarios presented in the adventute and significantly less applicable in general.

Focusing on mechanical optimjzation rather than character concept often leads to madness, since feats are generally well placed within the same power bands (there are few stand out or trap options). For a crunvhy game, it's often best played descriptively.

Characters become mechanically more complex every level or two, so starting at higher levels can be very overwhelming for new players. Building out a higher level character means choosing a lot of feats, and often the utility of those feats is only really understood through play.