Sounds like you've got it well planned.
Is he in an actual nappy? I assume since he's 4 it's a pull up type thing which are essentially like putting on pants - just don't accidentally stick your nail in anything yucky when taking it off :p Have the nappy bag, wipes and new nappy all ready next to you so it's a quick and simple process.
umm I guess keep it fun, be flexiable and don't let him take advantage (as a teacher I'm sure you know all this anyways lol)
You'll be fine, have fun xx
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