You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
How to do laminate flooring on stairs.
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Things i mention in this vid.
The first thing to do is to remove carpeting and check the stairs for squeaks and make sure the stairs are flat.
You need to take care of the treads risers and stair noses which can get a bit complicated at times.
Watch how to install laminate flooring on stairs video.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
Step 1 preration removing carpet creaky stairs if your stairs have and overhang this need to be removed or the space below the overhang needs to be filled in.
However installing laminate flooring on your stairs is a completely different matter.