My 2 cents. Anyone of my customers who buys a race plug boot we tell them to do this. As mentioned above in a true race plug there isnt much liner to pack out. Any of the lace up liners there is very little padding period. we tell our customers go wear the boot and have a sharpie in hand. Mark any hotspots, ankle bones, sixth toes, etc. Bring the boots back we can punch, grind etc. Anyone selling plug boots understand these boots were designed to grind. I believe it is way easier to work with a customer before they ski the boot and it is possible to get them dialed in before they ski and do small tweaks after the fact. when you ski the boot with no work on it and come into a shop in pain, it will be hard to tell if the grinding and punching is working because your foot is in so much pain we wont be able to tell if we got the problem fixed or not. I agree skiing a non-plug boot packs it out much faster than wearing it around the house, as for plug boots if it is sore before ou ski it it is onl going to kill you when you ski it.
My boot guy got my Raptor 150's right on the 1st time. Lotsa grinding and so forth, I mean come on it is a 95mm forefoot and I have a high instep and wide forefoot, but he has been working on my boots for years. I wore them around the house a bunch!!!
Skied on them all day the 1st day and never went back for any additional work! Even better the 2nd day out and the by the 3rd time the boots were completely dialed in (and probably so were my feet)
It is a misstatement IMHO that wearing them at home will shape the liner in the wrong places. If your feet are not flopping around in the boot skiing how are they going to be moving all over just walking around in them. particularly when i would assume the reason you are wering them at home is because they are very tight to begin with????
Skiing will break them in quicker, no doubt, but the combo is the way to go. You go out and ski in a boot without wearing them a few days 1/2 hour at a time and I gurantee you will be in agony unless you have pencil feet!
also anypain that bothers you at home will be magnified 10 fold on the hill!