Install a Minecraft mod or add-on that adds nautiluses
Obtain the mod/add-on from a trusted source
Follow the mod’s instructions to spawn or find a nautilus
Gather the required taming item from the mod’s recipe or guide
Approach the nautilus carefully
Use the taming item on the nautilus
Repeat if the mod requires multiple attempts
Wait for the taming confirmation if the mod provides one
Use a lead, saddle, or control item if the mod supports it