Hi
As I native speaker from the UK I wouldn �t say "do the check in" but only "check in".
e.g. at a hotel " Please check in on arrival". Alternatively at the aiport we would often hear or use "Please go to check in" either as a verb or as a noun i.e. the check in desks/area.
We also set a trend, not make a trend.
As far as I am aware, tendency would usually be used as a noun.
e.g. He has a tendency for exaggeration.
Maybe other �s have different ideas/opinions.
Regards
Elisabeth