Is treadmill assembly difficult?
Treadmill assembly is not terribly straightforward. Treadmills are heavy, cumbersome and complex, and putting them together can take trained professionals several hours to complete. Assembly also tends to require an extra set of hands to hold pieces in place while attaching others.
If you put together your treadmill incorrectly, the machine might come apart. For this reason, treadmill assembly is not typically recommended as a DIY venture — so hire a pro instead.