I suggest you put the staircase backing on the staircase first because that way it's square and ready to have the treads and risers added on.
Everything is straight forward up to the point of the risers and treads. It seems like a pretty easy and basic thing to do. You just put the risers on first and then the treads. You have to position the treads flush with the left side of the staircase and over hanging on the right. This is because the left side sits flush to the wall. This is vital.
Dry fit your staircase sides until it's clear which side goes to the wall. Forget the “right” “left” instructions, dry fit it and see for yourself so that it's clear. You don’t want to have to take apart your staircase after it's done. If you don’t make the correct side flush, you won't be able to fit the staircase in correctly. Also make sure you use the shorter five treads towards the top of the staircase.
The risers on the top half of the staircase are just not long enough to reach the ends so I’ve had to squeeze the front of the staircase together with clamps so they will reach.
The staircase looks straight. I had done a dry fit of it before hand and it fit well but I haven’t tested it again after the treads and risers were put in. I have to wallpaper the wall the staircase is going on before I install it.
