Best answer by Adzdalton
If your staying with an android OS that is e.g. Samsung or google ect.
It's not too different to what you have now, just some small changes here and there and a fresh look.
The way you access your apps and settings will be the same.
Now they'll be some new features of course to get to grips with as with any new phone.
Once you've figured out how to use one android phone, picking up another and using it isn't too difficult.
Going for another OS based phone e.g. Apple would be a different matter and would require time to master their OS system.