Mid-month, midweek moves are cheaper, and the savings show up fast. A typical US move runs about $4,500, but the real sticker shock is that almost all of it lands in the same week: the deposit, the movers, the truck, the supplies, the new utilities. That pile of one-time costs is exactly what a long zero-interest window is built for, because you can spread the pain instead of choosing what to skip.
The trick is timing. You do not get to spend the money slowly and you cannot spread it after the fact, so the plan is simple: front-load the booking where lead time saves you money, pay the things that have to be paid right now on the card, and pay the balance down inside the window. That last part is the part most people skip, and it is the part that costs them.
The 0% intro APR for 15 months is a deadline, not free money. Any balance still sitting on the card after month 15 starts accruing interest at the regular rate, and the rate applies retroactively to the full original amount in some cases. So treat the $300-a-month plan as the floor, not the ceiling, and aim to be at zero well before the window closes.