yes, there are screws at the base of the windshield. and yup, you can roll the dash on the lower 2 bolts that go into the pillars, (Im pretty sure youre envisioning the procedure correctly)
but I think its easier to take it (the dash) off those bolts and force it towards the seats, just roll it back as your primary goal, that way you can see what you really have to disconnect, and dont.
Shop Key tells you to do many steps I dont think are neccessary, but I dont think they tell you to remove the column, just to drop it. Id suggest getting it right out of the car, it speeds up the job.
again, you'll see when youre done really how simple it is. (as long as you dont get frustrated)
also, cap off the heater core pipes with some rubber plugs or whatever, it helps prevent spilling some anti freeze inside the car when you remove the box.
good luck to you.
edit: ya, you pull the box out from behind the dash, but it should be off the "roll over" bolts at that time, just sorta laying on the seats, with alot of stuff still attached to it.