Music! It varies from piece to piece, but my current project is all about high-energy bebop: Charles Mingus, Charlie Parker, Miles Davis, etc. If I start writing because I had something I was dying to get down, but forget to tell Alexa to play me an album, my momentum wains as soon as I've gotten out that paragraph or two. Starting cold without some Mingus has become extremely difficult too. Music activates memory and emotion better than almost any other stimulus. You've heard of "state dependent memory?" It's the principle in psychology that states something to the effect that you're more likely to recall information you learned if your mind is in the same state as it was when you learned it. This is most often sited in reference to things like narcotics and alcohol. If you study stoned, take the test stoned. Obviously that's not the best recipe for success for most people, but whatever state you were in before is the best for repeating the process as rote later. This is just as true when trying to jump back in on a project. It's infinitely easier to continue where you left off if you feel the same as you did before. When I was in my twenties, I thought I could only write drunk. I now know that was ridiculous. Routine and consistency in environment are just as effective and come with fewer inherent problems. I read a swath of articles and interviews culling every bit of advice I could find from professional, published authors. Music as an essential writing tool was mentioned frequently, and if you need a good place to start, the most often used by these authors was by far The Beatles. I sympathize with your distraction and procrastination issues. I am the undisputed king of tangents. I can find hours worth of distraction in a stray length of thread, so imagine me on a computer. I currently have seven tabs open in Firefox and eleven windows underneath. It's only eleven o'clock. When I sit down to write though, that's what I do. I let myself jump around when I need to though. If I try to concentrate too hard for too long, I loose all forward progress. It's an ADD thing. Getting lost on Wikipedia for ten minutes is as good as getting up and stretching, just so long as I come back, and again, momentum created by routine and environment is a big help in bringing me back to task. Lastly, and this probably wouldn't work for everyone, but it's absolutely worth trying: I used to do little writing exercises before I tackled my project for the day. I'd write three haikus or start a timer for five minutes and write stream of consciousness nonsense until the alarm went off. It sounds ridiculous, but pick any exercise a high school English teacher might give you. It's like warming up before a workout. The end product can be, and often is, hilariously bad. It doesn't matter though. It's just an exercise. You might be surprised how much easier the words come after priming the part of your brain that writes. In the end though, you have to follow the old cliche: Just write! Another thing I learned from all those writers talking about their processes is that the beginning of a novel especially, but also the first few paragraphs of a chapter or scene are often the worst prose in the entire first draft. You just have to get something, anything on the page to get going. Edit later. Finally following this advice after ignoring it for years has helped me immensely of late.