Question Easiest Public Transit Route from Nepliget to Andrassy Opera?

We're arriving in Budapest at Nepliget Bus Station via Flixbus, coming from Zagreb due to the lack of fast train options. We'll have luggage with us and need to get to the Andrassy Opera subway station area. I'm looking for the public transit route with the least changes to make it easier with our bags. Does anyone know the best way to do this? Any tips for navigating Budapest's public transport with luggage would also be super helpful!