I'm approaching 2 years now on the 319/320/321 after many years on the 737. I agree with a previous poster that you should try and get the systems work done beforehand. Our Company had a very good home study programme on disc for us.
With that out of the way, you will have more time and mental energy to devote to the FBW/glass business. At first loading the MCDU seems to take for ever, but with practice, you'll be amazed how it all falls into place. In no time at all you'll love the displays in front of you on the PFD (primary flight display) and the ND (nav display). Did I say that learning the 'bus acronyms is important as well!
Our airline has a policy of always "calling the boxes." These are the annunciations you will see on the FMA "flight mode annunciator" at the top of your PFD. This will alert you to what the aircraft is doing, ie: capturing an altitude, intercepting a glide slope, etc. You may think that you have "instructed" the aircraft to do something by your knob-twiddling manipulations on the FCU (flight control unit), but until you see the appropriate annunciation, don't believe that it will happen. Good practice is to look for the altitude selection knob, for example, (later you won't have to look as hard) but then divert your eyes to the FMA to be sure that what you've selected is correct. Should help you avoid a lot of early mistakes.
Otherwise, remember it's still just an airplane and old techniques still come into play.
And oh yes, you "pull" to gain pilot control, and "push" to give control to the aircraft. After a day on course you'll know what I mean.
Good luck.
Sawbones