Procrastination is a complex topic and can be related to perfectionism, anxiety, need for love, need for exitment, low frustration tolerance, hostility, depression and so on. There are cognitive behavioral therapies to overcome this, based on disputing your irrational beliefs. I have Overcoming Procrastination by Albert Ellis, Ph. D. and William J. Knaus, Ed. d., but I keep on procrastinating about reading it thoroughly.
But for small things, like paying a bill, answering an email, doing chores, etc., Do it when you think of it is a useful mantra that helps me a litte bit. You do it as soon as you think of it and not one second later. It prevents the tasks from piling up and dealing with having to relocate the material, etc.
And don't put off putting together your BOB until it's time to actually bug-out cause it will be too late!
Good luck.