Doing problems: think then write, or write while thinking?

I've been working on the 'To Do List' problems for Month One. The way I've been doing them is writing out an evaluation of the position and a longish To Do List, writing down each thing as I think of it, then inspecting the list to prioritize the plans, and so on.

Are others writing it out as they do it, or do you work through all the plans and such in your mind first, and only then write down what your thoughts were? That is, do you write out your thoughts as you work on the problems, or do you just do it all in your head and write down what you were thinking after the fact?

I sort of feel guilty for writing it down, as I can't do that in real games (if only we could ), but my thought is that if I work on it in a really organized fashion on my own time, when I'm playing actual games it will help me be a little more organized.

On the other hand, they say it is important to "practice how you play." If I am training for a marathon, it is a mistake to train by doing cross-country skiing. Especially as you get closer to a competition, you need to practice by doing things that are fairly specific to the sport (i.e., long distance running). In this case, perhaps a few months before a tournament, you can do general stuff you wouldn't do during a real game, but as the tournament approaches, you don't want to keep writing stuff out.

But since this isn't like marathons, where there is literally an "off" season (fall through winter), in chess it is always in season, so perhaps I shouldn't be doing the problems like this. I should do the to do list, pick a move I like, all in my head, and THEN write out my to do list and all the thoughts I had.

What is everyone doing with the problems? Writing while, or writing after? (Or writing not at all)

The next problem I do I will try to do it all in my head before writing anything out.

I kind of do both.
I do initial evaluation in my head, read all the course notes again & then go back 2 days later & write it down ( & try to avoid looking for answers in the intervening period although the urge to see if I am right is strong!)
Maybe I have the best or worst of both worlds by doing it twice but I thionk it works for me.

I write after.

Solve, well atleast try , in my head and then write it down and hope my solution is good.

I suppose I should switch to doing the to do list in my head, and only write it down once I've decided on a move. Better to emulate game conditions.

I write during and after as well... but I must admit that I am giving myself more time to compensate for the note-taking.