you don't have to check in 2 hours before, but the easy jet web site does state that they don't actually do connecting flights, each leg is considered a different contract, and they recommend at least 2 hours betwen legs. Realistically one and a half hours should be fine, but I don't know how accomodating they will be if there's a hiccup as you haven't left yourself the time they recommend.
But as I say, if all goes well, and it usually doesn, 1.5 hours is bags of time. Can you check in online now for easy jet flights? If so, that may also save you time/ agro.
How long are you going for? No way you can tighten your belt and go hand luggage only (the ammount you can squeeze in is amazing - i usually travel HL only) that would save you a lot of stress, but not really nec. 1.5 is fine, if flights behaving.
Good luck and enjoy your holiday