Just stop in when your walking by. I was just in there last week passing through the store several times and there was never a line of people. They said it only takes a few minutes to make them. Id say that the morning would be the best though. The stores dont have nearly as many people in them in the morning but are always busy at night when everyone is shopping on their way out the door.
I agree with mornings. We went during one of the most busiest times of year and had it done in the morning no wait but when we walked by in the afternoon there was a wait, no sure how long it was though as we had already done it so I didnt ask. It is very quick process though. I love mine too, so worth it
It won't matter if they are messy or filled with sugar, it's a silhouette, not a photo or drawing.
I agree with getting them done earlier though, less wait earlier in the day, you can then either carry them in a bag (they are small) or you can get a locker if you are worried about them getting creased.
Yes it would, my dd's hair looks a lot higher after a couple rides on BTMRR and Splash, a good 1 inch higher it seems sometimes! Also durring the silhouettes they expect you to sit still for a little while... Stick a churro in my kids and you can't make em sit still for more than 2 seconds!