I think this is largely due to our Si. I realize when ever I have to do something i do not already have a routine way of doing, in other words when I have to use Te, I tend to do comfortable things that I routinely do, like at my favorite food, watch my favorite show, tell myself I'm gonna gonna play video games for 30 mins before I do my work. I notice once I have a established routine method to getting something done, I procrastinate much less, I notice this whenever I am given a task to do an think ti's "easy", it's not that it's easy, it's that I already have an established method to get it done, (My Si has experience with the task) once that is recognized I can move forward and get it done (Te), but if I am given a task I have no idea how to do I procrastinate like hell (My Si has no experience with it), and my procrastination is essientially me using my Si to do other routines ( This is literally like my body recognizing it needs Si to complete the Te task and using Si elsewhere). I also tend to get very anxious when given an unfamiliar task and me doing familiar things is an attempt to calm my anxiety. With this knowledge I think you can just throw yourself into the unfamiliar just to get familiar with it so it can be easier the next time you do it, I think it gives you a good amount of confidence as well.