You've likely seen that some companies produce camera-based security systems that they claim can be installed by homeowners or businesspeople without much trouble. The problem is that one person's assessment of "not much trouble" is not the same as another's. Often, it turns out that these companies market as if they expect all homeowners to also be handymen who are used to doing fairly extensive DIY projects. If you do not fit that description, you'll find that it's better to hire a professional video surveillance system installer.