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Yes it is easier in PSP : you directly put the ratio in the appropriate field 
Usually it is easier to remove black borders before trying to resize pictures to correct ratio, except in some rare cases where the ratio of picture is weird because a part of the border was really part of the picture.
In the link that you posted they mention 1.66 for european movies, it is rather 1.85 for these. 1.66 is more used for european TV-movies/series, or some "recent" US series.
Usually it is easier to remove black borders before trying to resize pictures to correct ratio, except in some rare cases where the ratio of picture is weird because a part of the border was really part of the picture.
In the link that you posted they mention 1.66 for european movies, it is rather 1.85 for these. 1.66 is more used for european TV-movies/series, or some "recent" US series.