By press, I mean you can use a special made commercial press. Otherwise the bottle method and kneading works best. Fill a wine bottle full of pretty hot water, roll it over parchment packet containing the sifted hash. Once nice and soft + warm I would then take it out and knead it into a ball or brick.
If you go the really pressing route, usually use a brick mold and a hydraulic press + heat to make a nice block of hash.
Burping in a container and using bovedas will help move moisture outwards form the hash block/ball and develop nice color flavor and smell.