Switching the shower head is usually no problem at all, you basically just take the old one off and replace it.
The valve is a different story. If you have access to the wall behind it, then it's not usually a huge deal, but if it's an exterior wall or if your kitchen cabinets are on the other side of the wall or something, then you have start taking apart your shower surround which is much more involved. You might be able to find new trim that'll work with your existing valve, if aesthetics are your main reason to the change. And sometimes you can even find a new cartridge to work with the old valve as well. But that's a lot harder if you have no way of knowing the manufacturer.
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