Score the caulk line along the top edge with a utility knife
Remove any paint seal between the baseboard and wall
Locate and remove nails with a pry bar or nail puller if exposed
Insert a putty knife or trim puller behind the baseboard
Gently pry the baseboard away from the wall
Work along the length in small sections to avoid damaging drywall
Use a wood block behind the pry bar to protect the wall
Pull the baseboard off once it loosens
Remove any remaining nails from the wall or baseboard
Patch nail holes and wall damage if needed