Direct mount stems

Afternoon all. Have acquired a bike with dual-crown Domain forks and would like a direct mount stem to make it go faster 
The bike has a conventional stem at the moment and I would like to know if it really is as easy as unbolting it and bolting a direct mount in its place. Not entirely sure about the headset/top cap/preload arrangements with a direct mount stem :?
Any advice welcome
Cheers

The bike has a conventional stem at the moment and I would like to know if it really is as easy as unbolting it and bolting a direct mount in its place. Not entirely sure about the headset/top cap/preload arrangements with a direct mount stem :?
Any advice welcome
Cheers
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