The poster is asking how hard it is. If you don't know what you're doing, very. Lots of details and thought and reasonings are involved. But it really depends;

The poster is asking how hard it is. If you don't know what you're doing, very. Lots of details and thought and reasonings are involved. But it really depends; if its just your side project, and your UI won't matter much, then do it yourself. If you need to nail the UI in order for your app to be successful, subcontract it out.