Anything from changing your eye color to shifting to a fantasy reality with 0 in common to your CR takes the SAME AMOUNT OF ENERGY!! Same effort too! So if you want to wait until your script is finished, do it. If you wanna shift 1 detail at a time in a series of shifts, do it.
It genuinely is as easy as doing whatever you want to do. The only thing in yohr way is you.
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