Super easy if you are buying from Oregon, they have a title so make sure they have it. Bring it to Idaho and make sure you bring the sled, title and bill of sale to the DMV and they will do a vin inspection. They'll register it and give you a temp title while the new one is issued in Idaho. If it has an aftermarket tunnel it makes it a little harder but there are ways to get that done as well, just make sure you have the original vin stamped in it or the old vin cut from the old tunnel and riveted nicely on the new tunnel.