Unless you have a foot feature you need addressed, like a bunion/bone spur, I would ski them a little bit first, the boot liner will pack out naturally with use. When you heat mold, you're essentially making your boot bigger in certain points and is not-reversible. I DO recommend a custom footbed, I use Masterfit. If you can't afford a custom, even a cheaper product like Superfeet is recommended. All the brands generally assume everyone goes the footbed route, and essentially sell boots outta the box with "disposable" footbeds. DO NOT use a "gel" or "cork" footbeds - they get stiff when it's cold and super mushy when it's hot. Before I could afford Masterfit, I used the Superfeet Marino (doesn't smell). One more point if you go the superfeet route - don't buy your specific foot size - take the footbeds out of the box and see what matches your foot's arch the best, then trace the factory footbed and trim to fit inside your liner. I needed like a size 11 to match my arch the best, and trimmed to fit in my 265 boot...