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Pay attention to the power load - not all smart switches handle halogen lamps or LED dimmers equally well. Check beforehand which devices you want to switch and whether the switch is suitable for them. When installing, you should turn off the power and if you're unsure, just ask an electrician so you don't break anything. And remember that some smart home systems don't work well together - check beforehand whether everything's compatible.
I did that at my place too and I gotta be honest, the most important things are: first, check whether your electrical installation can handle it (some old houses have issues with that), and second, plan properly which switches you actually need, because it gets expensive real quick. With me it was like, I initially went with wireless switches because I didn't want to re-run cables, but later I switched to wired ones because they're just way more reliable. If you're not in the trade, I'd really recommend getting an electrician's opinion, not because of the costs but because your safety is on the line - this isn't something like mushroom picking where you can just fix mistakes quickly.
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