Perhaps the largest step, analogue to digital is a mental one, for both maintainers and Aircrews. No message = no fault ( for all intents and purposes )
The digital airplane presents everyone with a HUGE amount of information via symbology etc, that was simply never there before. Sit down with your books and become familiar with the many " states " that particular valves or other hardware can adopt. Understanding the symbology is a must for both the digital maintainer and operator.
As previously suggested, remember that certain inhibits are set for various flight phases. this is crucial in some troubleshooting scenarios.
Many engine related fault messages may not show without FADEC power and embarassingly appear ( or reappear ) after engine start, with your hollow assurances of complete airworthiness still ringing fresh in the crews shell like ears.
Know thee thy TSM and follow it religiously. whilst not always perfect, it IS your friend.
Know thee thy MEL for within it's hallowed bindings may ye find the veritable " thank christ " on occasion.
Know thee thy C/B locations for truly they often show the way to a messageless screen.
Above all, no matter how much things change, they stay the same. in other words - Know thee thy Airplane and it's systems for verily, from that knowledge, great escapes have been performed.
