An Airbus FBW flies manually just the same as any other modern jet. There is no difference in how the controls work in manual flight apart from the side-stick, but that is really easy.
Thrust levers, gear, flaps, speed brake, ground spoilers, wheel brakes, reversers, taxiing, all have the same controls and work the same as any other modern jet, with a couple of minor differences. You still push the thrust levers forward for more thrust, pull them back for less. You pull the side-stick back to pitch up, push forward to pitch down. You move the side-stick sideways to roll. The speed-brake lever is clicked out in length to arm the ground spoilers and there are push buttons instead of a rotary switch for auto-brake. Rudder pedals and wheel brakes and steering tillers are the same.
You don't have to trim anything. It stays in the attitude you put it. The trick is to use the stick to set the attitude you want, then let the stick centralise. The aircraft will then stay there, in that attitude (barring large turbulence upsets). (The FBW will modify side-stick inputs, and limit extreme ones, but in normal flying to approach and land, this will not be evident).
If presented with an Airbus FBW in manual, you would have very little trouble flying it and landing it
