Cut the flooring boards to size using a circular saw.
How to install wood laminate flooring on stairs.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
Nail the boards into place with finishing nails.
However installing laminate flooring on your stairs is a completely different matter.
You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
You need to take care of the treads risers and stair noses which can get a bit complicated at times.
Apply flooring glue of the back of the boards and place them on the steps.