serial interviewing is pointless, unless one is a generalist and has to overcome massive competition, but going in a portant interview with that first time anxiety or not having practiced one's answer well to bullshit questions is not optimal either

a couple interview lined up before an important one is less commitment and still effective.

not really happy about having to waste some HR guy time for a job I'd likely not take, but hr types have had no qualms about wasting my time either in the past so I see it as a return in kind