Quick Answer
Do you need a professional to install a security camera?
Not always, but it depends on the system. A single wireless camera is straightforward to fit yourself: test the equipment with a dry run in the intended position, choose a camera suited to the lighting, and follow the app setup. Professional help becomes worthwhile once cabling is involved, when several cameras must feed one recorder, or when footage needs to stand up as evidence. Wiring errors and poor framing are the usual reasons DIY systems disappoint.