When it's my turn to move, I open up the Word doc where I'm keeping a record of my thoughts for that game, and then get a board ready. (I'm doing it on my computer, but I have the brain turned off.)
I make a note of my opponent's move, and general thoughts on what I think he's up to. Then I write down my "gut feeling" about which moves I should consider; this is at least two moves, usually three.
Then for each of those moves, I play them out for a while to see if I notice anything. I flip the board to my opponent's view occasionally while doing this. While doing this, I make notes on which of my candidate moves is feeling the best. If I notice other candidate moves I should consider, I add them and then analyze them, too.
After all that, I go back and just focus a bit on his responses to my preferred move. Have I forgotten any obvious replies? Etc. If it looks good, I move.
It takes a lot of time, but I'm only playing 3 games this way, so it's not too bad. It's great exercise; I've never actually done this before, I hope I'm learning a lot. Eventually I'd like to be able to do all this in my head, but I'm pretty bad at visualizing.
Good advice!