While the Nest fetches a hefty $250, one upside is you shouldn’t have to pay anyone to install it. It comes with simple instructions and the right tools to make the transition from the old unit to the new one. The power requirements are small so there is little risk of electrical shock (although you should always exercise caution).
Once the base plate is mounted there is a built-in level to help balance it out. Then all you need to do is snap it in and fire it up.