Cartridge bearings also DO HAVE a certain amount of play in them. They might feel loose simply because they click, but that play is built into the bearing and is normal and does not indicate a need for service. If the bearings are silent, not gritty and roll smooth, just leave them alone.
As for special tools it all depends on how the part was manufactured as to whether or not you need a press or some other tool. Old Phil hubs, you need an arbor press, new ones you don't, old Suntour hubs, just a special wrench..the bearings just slid in and out. If you have doubts, ask for guidance on your particular part.