Design research and web design research are activities that can be happening along the entire course of a redesign project. They tend to (and should) happen organically as questions arise, so it’s likely you’re more than satisfactorily addressing at least a few of the above warnings. However, these are called pitfalls for a reason: at one time or another, one or more of these oversights has very possibly tripped you up, whether or not you were aware of the cause.