on knowing what you want to make, and not knowing how to make it:

it is tempting to bang away at it, though it is not yet clear. but don’t do that - don’t bang.

it is more likely that you need to become, somehow, the person who can make it. maybe it is skill - so, for paintings, practice painting. learn to let practice be its own practice. 

but maybe it is something else. maybe it’s growth somewhere that you can’t yet put your finger on.

maybe there is a conversation you need to have. maybe it is an experience you need, maybe it is courage, or confidence.

or maybe it is feeling fiercely protected by a friend so that you understand, deeply, how precious you are, and powerful, and complete.

and then one day you sit down, realize you know exactly what to do, and you begin.