Baking boot shells.

So I've got a pair of fischer vaccum boots that I need to modify for this season. I need a little more room in the toes. The shop I work for doesnt do the fischer process but we have the oven for doing the salomon shell process. Is there any meaningful difference in baking the shell? I dont really want to shell out $150 to have the boots molded at another shop when I could possibly bake them myself