Some assembly may be required and depends on the hydraulic pressing machine that is purchased.  Workshop Presses typically come with they power pack safely packed on their bed, and after being put into place need to be secured to the frame of the press and the hoses need to be connected.  A good majority of the hydraulics presses sold by The Workshop Press Company come ready to use.  Large presses will require some building up and this process is carried out by factory professionals.