Keep in mind that this is a fun kids project and not a professional job. All in all it took about an hour and was great fun! The kids still remember it fondly.
The paint does itch when it dries if it's not meant for the skin. It will wash off quickly in the shower. You can do that while the other person occupies the kids - because they are sad to see the pumpkin leave. Don't do it before you have a ton of photo! Consider doing some special poses before cleaning it all off!