We flew short-haul with DD when she was tiny. For European flights you hardly get these bassinets and if then there are only a handful and they have a weight restriction of 9kg I think.
Under 2s don't have their own seat so they sit on your lap. If you're lucky and the flight is not fully booked they MIGHT give you a row but we only had this twice.
I always fed DD before take-off so didn't have to deal with bottles or food. When she was older she got a sip of bottled water against the pressure and I normally had something to snack on in my handbag.
With no seat you also don't have hand-luggage allowance for your baby. Hold luggage depends a lot on the airline, we had nothing, 1/2 the usual limit and the full limit. Each airline also has their own rules regarding car seats and prams to take with you.
I found baby is easy if you're prepared and not stressed. Don't worry about naps as they fly out of the window. DD either didn't sleep despite totally tired or slept at times where I didn't expect her to do.
Please do not take toys that makes noises. I also fly a lot because of work and nothing is more annoying than people with too-loud stereos or toys which blinks and screams. Take things you don't mind loosing/forgetting. DD's favourite entertainment is still the emergency detail card, she is 5 now.
Take enough nappies to survive delays. We had once 3 hours in Heathrow. Change just before boarding and don't change short-haul unless your baby did a poo, the space in the toilet is very limited. Take a full outfit and also a top for you/your partner in case your baby is sick or you spill milk over you.
Have fun.