The simple answer is to fly with BA, KLM, Lufthansa Brussels airlines etc, I am finding on almost every trip now (as a single traveller) they are cheaper than Easy, Monarch or Ryanair.
The booking is easier, simpler & more transparent.
I was in BCN last week & the check in hall was awash with dozens of pax re packing suitcases by the Ryanair desks. Looked like a refugee camp than an airport.
The week before I was in Alicante, where the Easy Speedy boarding check in queue was about 30 people deep because every pax at the front was arguing about excess baggage.
It ain't worth it. Just how many people fly these "low Co" airlines & actually end up paying more than legacy carriers?