After doing A108 I moved on to Messy One #3, two puzzles in a row by Nasenbaer.
I think I found this one a bit harder than Messy One #1, possibly because I took some time to find the key step, the innie-outie on N2 which leads directly to the naked quad in C3. My methodical approach must have been upset by this being a Messy One!
Maybe 45s on rows, columns and corner nonets are easier to spot. Just a thought!
The key step is part of a narrow path to start this puzzle. Maybe I'm going a bit high but I'll rate it as High 1.0.
I won't post a full walkthrough. My one was fairly similar to Afmob's apart from the order of some steps.