You hire an NPC to cast it for you, hence my comment about finances. When I originally posted the quickstep, after Doc Roc & I came up with it, it was used to let a level six Kobold qualify for Epic Spellcasting, so hiring an NPC was more affordable. I think I've got the cost figures hanging around:
Casting of Psychic Reformation: (405) (to pay for the 25 xp the npc expends)
Casting of Polymorph: (280)
A farm full of chickens / cows / etc. (variable cost)
If you're a wizard with a book full of spells, you could probably just sell that to raise the cash, relying on the spells currently in your memory to meet the incantrix pre-reqs, then acquire another spellbook while you're second level. Or just use any of the many and varied ways to break the D&D economy in half.