Wear thick socks and walk around in the boots for short periods
Use a boot stretcher designed for leather boots
Apply a leather stretching spray before wearing or stretching
Insert a boot stretcher and leave it in overnight
Use a hair dryer on low heat while wearing thick socks, then walk until cool
Stuff the boots tightly with socks or newspaper and leave them overnight
Take the boots to a professional cobbler for stretching
Repeat stretching gradually to avoid damaging the leather