I've only once had to take over as the new 'big boss'-----
I was under a lot of pressure to get things going efficiently----most of the crew welcomed me and my style of organizing---
"Most" is the key word, The first week I had to get rid of one guy, fortunately he was transferred to another job in the same company.
I also had trouble with another worker--Every time I turned my back he would defy my orders---we were short handed so I tolerated him for a month or so.
He quit on his own after many reprimands.
All in all it went well----I have my style---I only ask for a person to be the best they can be---and I provide training and tools so they can grow--
If your changes make sense to the workers,you will be fine.
Just remember,some people are bull headed and will fight you--those can cause trouble and might need to be fired or transferred out of your command.