Use the spot meter. Since the spot meter assumes it is reading middle gray, or Zone V, adjust your shutter/aperture to place the reading on the Zone you want in your print.
That is what I do, I measure a middle grey. But is is also possible with this meter to determine the contrast range of the subject and superpose that on the dynamic range of the film by taking more than one measurement. Doing this I should be able to place the low values and/or the high values on a favourable point in the range (that is, in relation to my subject). It should be predictable that way whether I use the whole ten zones, or just part of it. There the confusion comes in, because, how do I do that?