Becoming a Catholic is not really difficult. I believe that most Catholics were born into Catholic families and brought to the baptismal font before they were old enough to ask what was going on.

Living as a Catholic isn't terribly difficult. I know quite a few Catholics--most of my extended family are Catholic and just about everyone in my mostly Hispanic neighborhood is Catholic. Most of these seem to express their Catholicism by attendance, not always regular, at Sunday Mass and burning votive candles on a home altar.