How far is the airport from lizensk?
WAW Airport is about 4 hours unless you drive like a turtle (official Google Maps is 4:13 and you can do it faster). I always rent my own car there. KRK is less than 3 hours, a new highway was built last year, and time was cut much.
I am not a fan of connecting to RZE if you arrive in WAW or KRK (official Google maps 2.5 hours, if you arrive in FRA, definitely better to arrive in RZE), because RZE from Lizensk is about 40 minutes, so why not rent a car in WAW and do the drive.