When you first start hiking in new boots, it is normal for them to hurt. This is because your feet are not used to the new level of support and cushioning that the boots provide. The best way to break in new hiking boots is to wear them around the house for a few hours each day. This will help your feet get used to the new boots without having to endure long hikes with sore feet. Once you have worn them around the house for a week or so, they should start feeling more comfortable on longer hikes.