The easiest way to tackle stairs is get a book at the library...free.
Stairs and railings are never easy. I have done any type you can think of, curved, convex,spiral,flaired and landings galore.
I still have to make jigs to keep everything the same and at the least measure 8 times and cut once. The issue is you only get one try.
Getting a book will help with pictures and steps and pitfalls.
Good luck with it....patience is a must .