No, I hadn't planned to Apparate into the zoo. Mum might not be suited for Apparation, and I don't need trouble with I thought we would enter the proper way, so there would be no unfairness there or risk of being seen by Muggles. I doubt any Obliviator wants to work possibly on a weekend if he or she doesn't have or add on to the work he or she is likely already having to do during the week.
Well, some people are a little more particular than others and would prefer their things not charmed or not charmed by anyone else. esp I do know how to perform the spell, so at least it wouldn't wind up shredded, but also didn't want to presume it was something you'd be fine with.