I let me scouts take care of preparing for future opposition. I spend a lot of time watching matches in non-league to see if I can find any good players as I usually manage a team in England with little to no resources.
I've watched some of my clubs Reserve matches and U18 matches. You usually find that the next day the press report that they seen you at the match checking on the development of your players and they all received a moral boost as a result.
I go watch my own players when they are out on loan and i attend all the next gen series games my team are involved in that i can. I also go watch most of the Scotland games as well. I have occasionally gone to scout players, but i dont buy a lot of players so and those i do tend to be youngsters.