I use Ilford HP5+ because there is not Tri-X 400 in 4"x5".
I like to remove the lens cap and then pull the dark slide. I often manage to do that on the first sheet almost every time. With my focal plane shutters and 4"x5" I like to remove the lens cap, open the shutter, pull the dark slide, then crank the focal plane shutter, thus ruin a good sheet of film with a diagonal before I start my serious work.
Then I wonder why I do not shoot sheet film often.