At the time of writing, I've just finished pulling together some notes and resources for a writing workshop that I'm running in my home town. This brought me back to my spine-damaged and well-read copy of Steven Pressfield's The War of Art; for my money the best book on overcoming obstacles to doing creative work.
That led me onto YouTube, and to this clip, in which Pressfield summarises his ideas on getting past those negative forces, which he terms "Resistance":
The War of Art (and its sequel Do The Work) is well worth your time, as are Pressfield's novels, most notably Gates of Fire and The Afghan Campaign, which are among the finest historical novels I've ever read. Pressfield's website is here.
My own novels Torc and The Prospect of This City are available here.