I must admit I sometimes find it difficult to work out my priorities (given all my jobs do actually need to be done!). This is where deadlines (actual and ones you set for yourself) can be useful. They give you something concrete to work towards, can help against procrastination and, I think, help you achieve more in terms of your writing than you would without them.
The biggest but nicest problem I have had this year is giving the right priority to publicizing From Light to Dark and Back Again (including taking part in things like the recent Chandler's Ford Book Fair) and getting on with my other writing. I know I will get this balance right eventually (experience does show!) but I also know I haven't got there yet (as I said, experience does show! So does lack of said experience!).