Cool to have you here, Sampsa - welcome.
As you mentioned, take it one day at a time. We are, for the first time in our lives, learning how to be here and stop our mental games that we impose on ourselves, so give yourself the time to practice the breathing tool we have as well as whenever you see you're in your mind - simply stop, breathe, bringing yourself back here, back into focus in the physical/your environment. So this will take time and, like I said, practice, but the more we do it, the more 'natural' it becomes, so patience with yourself. Don't allow yourself to react when you see you are thinking too much or not focusing on your breathing, that will just add more fuel to the fire. So moment to moment - whenever you remember, take a breath. Writing and self forgiveness definitely support in slowing ourselves down as well as ridding the thoughts from our mind as we are actually giving direction to the thoughts in our mind. So instead of them aimlessly floating around in our heads, we take them out, write them out, look at them, apply self forgiveness, give them direction, change our minds in essence about who we are, in thought, word and deed.
So it's a process - you are taking a cool step in your process with the DIP lite course, so enjoy.