InaP, i tell u what works for me, i guess everybody as his/her own way. make a proper plan, intro, chapters, titles help, then get whichever chapter u want to start with and make bullet points of the most important things u want to say, nothing elaborate, just a big idea and work around those points. whenver u get distracted look at the points and follow them. if u happen to have an idea, put it down, but dont develop. get the big picture first before going into details. hope this helps and good luck. i'm on the 1st year but have the plan sorted for the whole thing, it doeasnt matter it will change, cos it will, as long as u have something to work with and have control over your material, u should be on the right track.