Wear them indoors for short periods
Use thick socks
Apply leather conditioner or balm sparingly
Flex the soles and bend the boots by hand
Walk on soft surfaces first
Use a boot stretcher if needed
Focus on the heel and toe areas with gradual wear
Wear them with multiple sock layers for brief sessions
Use a hair dryer on low heat while flexing the leather carefully
Stuff them with socks or shoe trees between wears
Avoid soaking them in water
Increase wear time gradually each day