Also with Easyjet check, double check and triple check the size of the carry on luggage bags you're allowed now as they have form for reducing the size and making you pay extra at the gate to put it in the hold...
And be prepared for food etc costing a lot if you eat at the airport (though that'll prepare you for Paris prices a bit!). At security they will ask you to put anything metal and electronic in the trays - keys, earrings, belts, phones, laptops, tablets, cameras etc. You can buy deodorant etc at Boots, water at Smiths or other outlets past security but do check their opening hours before you fly especially if your flight is very early or late (I was horrified at how little choice there was at Newcastle last time we had a flight out of there after 7.30pm but Manchester is a lot bigger and busier or certainly used to be).
You'll usually be asked to take jackets and even heavy cardigans off and put them in trays as well. I'm not sure about Manchester as it's years since I've flown from there but personally I try to wear slip on shoes if possible as I've often been asked to put boots in the trays as well. Some airport security has seats and even tables once you're through to give you a chance to sort yourself out, others are a bit more scrabbly.
Everything should be very well signed though and even smaller airports often have automatic passport and boarding pass scanners now and will often just let you scan the codes from your phone. Again, not sure about the Manchester setup.
Enjoy the experience, anyway, and the wedding!