The following are the general steps to properly install the pipette head:

1. Prepare the pipette and suction head. Make sure the pipette and suction head are clean and check for any damage or dirt.

2. Insert the suction head into the top of the pipette cylinder, ensuring that the suction head is perfectly aligned with the pipette cylinder.

3. Insert the suction head firmly into the pipette cylinder with appropriate force. Ensure that the suction head is tightly connected to the cylinder to avoid loosening or detachment.

4. Check whether the suction head is correctly installed. Ensure that the suction head is centrally located in the pipette cylinder so that it can accurately absorb and release fluid.