How to break in brand new hiking boots in 3 days?

I never owned a pair of boots that needed a "break-in" period. Buy boots that fit your foot and two pair of socks. I have never had a blister from hiking with two pair of socks. Use Waximum or a similar boot grease to soften and waterproof leather.

Take a good walk in them. I hope they feel good on your feet or you shouldn't have bought them. On your hike if you feel any hot spot, stop. I don't want to endorse any product but at the pharmacy in the foot care section, look for Blister Blocker. It's a waxy substance that you apply to the troubled area. This will reduce the friction in a specific spot helping to reduce the chance of a blister. I suppose a lip balm might do the same trick. You need to address the trouble spot before it develops into a blister.

You can't break the boots and your feet in on such short notice. Bring moleskin (research how to apply it properly) and when your feet start getting hot take a break and take off the boots for 10+ minutes to give your feet a chance to recover before things get out of hand. Wait until your feet and boots are cool and dry before putting them back on. Every western medicine blind believer I've met does NOT recommend this, but I ALWAYS pop blisters as soon as they appear when they are very small. I, personally, have never gotten an infection from this and the blister growth is immediately stopped. Western medicine is totally opposed to this, but it seems to be a common practice among people of lesser 'civility', and they don't seem to have the big, infected blister problems that us, oh so smart, tenderfoots have. Monster blisters can be a game stopper for many. Good luck. Edit: Mountain Man - I have a very common foot issue. My heels are more square than round. Every single pair of boots I've had needed to be broken in. Everybody is different.

do the best you can. there's only so much you can do. go on walks, lots of walks, while wearing the boots. do as much as you can, but not so much that you start getting blisters before you even go on trail!

An old timer I worked with swore if he soaked the the boots with water inside and out, wore them wet for a day, dried them out - they conformed to your feet and he never had a problem. I couldn't see ruining a pair of new boots by soaking them.

wear your regular shoes. the need for big, clunky boots is overrated. but since you already have them... i'm not a fan of Moleskin because it's always slipped around my foot. I use duct tape and that's worked marvelously for me. as a preventative, put a piece of tape on the back of your hell and achilles before you start your hiking trip to prevent some of the friction from your boot. also on your big toe. then, as you hike, if you feel even the slightest bit of rubbing from your boot, put a piece of tape over it immediately to stop a blister from getting bigger. Neosporin also heals blisters a day faster than otherwise.

Old army method. Pee in them, and leave them overnight.