To install laminate flooring on stairs start by removing the overhang or the underside of the stairs with a jigsaw.
How to do laminate flooring on stairs.
Things i mention in this vid.
Woodwise stair jig scribe http amzn to 2swvftk subscribe for more.
You have to ensure that there are no gaps and spaces in the flooring and it is complete and perfect in every way.
The first thing to do is to remove carpeting and check the stairs for squeaks and make sure the stairs are flat.
Alternatively you could cover the overhang with plywood to make it level.
Here are the steps for installing laminate flooring on stairs.
You need to take care of the treads risers and stair noses which can get a bit complicated at times.
Once this is done measure and cut out your pieces of laminate to make tread pieces riser pieces and stair nosing.
Watch how to install laminate flooring on stairs video.