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