Beds in the Freshman Five & BARH are adjustable. You just need to pop out the bar and place it in the selected height. A hammer is beneficial, but you don’t need it to adjust the bed. Risers are not recommended for the Freshman Five & BARH as the beds are heavy. You can also choose to loft the beds.
For beds in Nason and Davison, these are not adjustable. You should get risers to raise the bed or choose to loft it.
For Barton, the beds are already lofted and you do not have to do anything.