These circles are are only as difficult as pilots make them. With the number one issue that I’ve seen, of pilots wanting to make them look like the same sight picture as a normal traffic pattern, which they aren’t. Being lower of an altitude AGL in most cases than a normal pattern, sometimes significantly, and trying to make the circling approach look like the normal traffic pattern results in a pattern position too close to the airport, with a resultant base-to-final overshoot that crews often try to salvage by overbank rather than proceeding straight-through and trying it again, or going missed if that’s not possible. The circling maneuver is going to look like you’re too low altitude-wise if you’re doing it right, but following the circling MDA and descending at a proper point in the pattern where you’d normally be at that altitude AGL, while remaining within your circling distance for your category, will all keep you within the TERPS protected area no matter how low the circling sight picture to the runway looks like. I see too many pilots that don’t seem to trust those facts. It’s why I enjoy teaching circling maneuvers at an airport from an approach, and the different circling options available and what they would look like, any circling restrictions permitting.