Train wise, you need to take a bus to Liverpool South, that's a new transport exchange where you can pick up a regional train towards Manchester. If you need a direct train to somewhere further than Manchester, you need to go to Lime Street.
Liverpool airport are currently toying with the idea of charging people to go through security, something Easyjet got very upset about as they stated, quite rightly, that they already paid good money for that and they did not see why their passengers ought to pay something twice.
As ever, the "terrorism" excuse is wheeled out to justify any restriction/quick buck making scheme....