There is something I always wanted to ask a composer but never knew one :)

When you compose for an instrument how much do you need to know of the way it is played? For eg. you have created such a beautiful one for the Clarinet. Did you ever need to consider the ease for someone who plays it, or did you already have an idea on how it would be played?

I love how artists like you can create such beauty and am always curious of the process.