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It's not a requirement to be registered. It's easy to go wrong though because lighting circuits cable colours can be all over the place. You might pull the switch and find 7 wires in there, the lighting loop and the switch drop. If you are careful and keep track of exactly what went where and your switches are like for like you should be fine. On the other hand you can search this thread for times where it's not straightforward.
As a safety measure you should always test any wires you are handling with a proper voltage tester. A professional would not rely on a contactless tester or a neon screwdriver. You need to know your voltage tester works. If you switch the power off to the whole house that should cover you in the event that you don't have a tester. This is especially worthwhile if you are changing switches in a hallway.
Don't twist the wires together in the terminal and make as sure as you can that all the connections are solid. If they're not you can get arcing which can lead to fires. Again a pro can but might not check the IR of any circuit they are working on, this would show them if there are loose connections. It's interesting if you have the capacity to check IR that you can correct weak joints by an extra turn of the screw.
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Airhead
Light switches and plug sockets...to change them it's a case of turning power off, taking old ones away from the wall and noting which wires go where, switch to new ones with wires in corresponding places, putting them back in the wall and turning the power back on...right?
I should be able to do this all myself, yes? It's not something that needs a qualified electrician?