In most frames, you can simply slide the motors into the mounts.
Route the wires neatly, that will reduce the change of damage. By twisting the wire pair, you can reduce its length.
To protect the wires on the motor bottom, use some feet!
3/8" thread protectors work well as feet for 8.5mm motors,
5/16" thread protectors fit 7mm motor,
1/4" thread protectors fit 6mm motors.
Heatshrink works too.
Check for right polarity of motor connections.
Unless you are using Blade motors, follow this:
- clockwise: red +, blue -
- counter clockwise: white +, black -
Motor direction/positions depend on the flight controller.
If you are using a RTF FC, make notes and take pictures how to wire up and position the motors.
If you are using a MultiWii or CleanFlight controller, the front left needs a CW motor/prop by default. The MultiWii/CF GUI displays required prop rotation if you change the default (e.g. by reversing YAW_DIRECTION).