I'm gonna say this.... 25 days is not a lot of time. I know it's in the past now, but the more time spent preparing the better. That said, my nephew was resistant at first (3 yo) and we played fun games together,me with mine,and his too- We called it 'monster mask' and play ed peekaboo,pretend 'scary monster' ,bribed with treats along the way,(example- ok,time to play monster mask! We will both put ours on for a minute and 'roar'...and then we go get a cookie!) Now he's like his little friends, they're all used to just wearing them as they play,no problem at all. With my younger nephew,he doesn;t wear one bc he's a baby still, but at first, he was getting scared bc people faces were covered by a mask, so we played lots of silly 'mask peekaboo' games till he thought it was just fun and no problems now.