Don't try to move the tank when it's full. That's just asking for disaster.
- Put the fish in buckets or coolers and drain the tank. There's no need to save the water unless it's saltwater or RO
- Remove all decor except the substrate. You don't want anything shifting and cracking the tank.
- If you're placing the new stand in the same location as the old stand, you'll need three or four strong people.
- Have two people pick up the aquarium and hold it. Move the old stand out and move the new stand in. Set the aquarium on the new stand. Level the new stand with shims before you fill the tank back up.