While looking over the beginning of Abomination Vaults, I went with this for how to modify the adventure since the group is level 2 going into it:
I moved the graveyard scene that you're supposed to run before moving on to the 2nd level to the beginning, using it as a transition between the Beginner Box and AV to get the group interested in the lighthouse. Once they reached Gauntlight, I had the mitflits in the first level all avoid fighting the group and just hinted at their presence to both establish they're a threat and make the place seem even more eerie. The mitflits all retreated back to the room where Boss Skrawng is located, so when the group opened that door at the end of the session they're in for a much tougher fight to start next week's session.
Worth mentioning I'm running a table of 6 players, so I'll have to adjust the entire thing to account for the larger group. The game's tight math makes it really easy to make those adjustments.
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