Shoot it on 35mm, with bracketing, the week before .

On a slightly more serious bent, experience gained with this issue in smaller formats can only help.

It is difficult to meter these scenes effectively. Experience may be your most important tool for this.

If you are shooting near dusk or dawn, a reading of the sky, adjusted for the tone you want, may be the most useful.

There are "exposure calculators" out there which are essentially lists of the exposures for different types of scenes that many have found helpful.

If you shoot digital as well, it can be useful to take digital shots at the same settings you are using for your film shots. Then, when you determine what the best film exposure was, you can compare it with the digital exposure at the same settings, to get an idea how the digital camera can be used as a meter in these sorts of situations.