Pretty easy with the right tools....and changing them out before they get to tight.
This might help:
https://www.backyardchickens.com/articles/leg-banding-with-zipties.68075/
Got my first mixed age and gender flock 6 years ago last Sept.
Had wanted chickens since I was 15 and spent a summer tending my brothers chooks in upstate NY.
Was a chicken sitter for 10 years for several friends before getting my own flock.
After a year of sitting on the couch mourning the...