Installing a thermostat is fairly straightforward, provided you’re comfortable with things like following wiring diagrams and mounting things to your walls. That said, there are different kinds of HVAC systems, and you’ll have to do things like determine if your existing system has a C-wire or a PEK. If you’re patient and can follow instructional videos closely, you’ll be able to install your ecobee in less than an hour. If any of this gives you heartburn, call a licensed contractor and have them install it for you.