‘I can usually hold the first few words or line for an hour or two, but that’s all. Although I can practice writing I have to be ready and prepared.’
You might also like:
‘For prose I need my fingers moving on a keyboard or a page; poetry tends to come to me out loud (I live alone fortunately).’
That first phrase or line is like a magnet drawing other words to it and they begin to gather, sometimes quickly, sometimes over years, but again have to be scribbled down before I forget them.