To break in new rock climbing boots and ensure a comfortable fit, follow these steps:

Start by wearing the boots at home for short periods to allow your feet to adjust gradually. Increase the duration and intensity of wear over time, wearing them during light activities and short walks. Once they feel more comfortable, use them for indoor climbing sessions on routes within your comfort zone. Progress to outdoor climbing on shorter and less challenging routes as the boots continue to break in. Prior to climbing, warm up your feet with exercises and stretches specific to the feet and ankles. Be patient and persistent, as breaking in climbing boots takes time and varies for each individual.