Hello there!
I am happy to tell you that I am starting this week strongly! I had a monstrous workout at the gym, with 32.5 kilometers of cycling, a few kilometers of running and 3 kilometers of rowing. I took a day off from work, and did some chores today at home. I also walked to the center and back. All this activity combined add up to at least 2000 calories. I will eat around 2000 calories. Given my base metabolic rate of around 2000 calories, I have created a deficit of around 2000. My goal was to have an average deficit of 1250 calories for this week, so this first day allows me some flexibility if I need it (I may end up getting a higher average deficit, but I think 1250 is optimal).
The mindset-related goal that I am working on is to learn to complete the goals that I set, as close as possible. That means to push myself sometimes to finish what I intended to do/started, and on the other hand to not set goals that are unrealistic. For example, today I set the goal of cycling 30 kilometers and rowing 3 kilometers, and it was a challenge (because exercising at the gym is not a habit yet) and I felt the temptation of doing a bit less, but I didn't, instead I did a bit more! On the other hand, I have not yet planned the rest of my week's exercises (I have only set targets, as you can see in my previous post), because I know that I am setting myself up to failure if I plan all my workouts now; I prefer evolving an exercise routine organically by just going exercising when I feel like it and by experimenting a bit (like by trying going to the gym in the morning, or trying new activities), then to see what sticks/what patterns emerge and only then making a schedule.
Bottom-line: I guess that I am looking for a balance/optimum between discipline/strictness on the one hand and fulfillment/flexibility/realism on the other.