Having to teach said equipment & ac can I say
1. Master the G1000 before you try flying in real IFR. It is excellent equipment but really does its best to tempt you away from AVIATE when the world is developing the shape of a pear.
2. Cat A /B . I would suggest that this is irrelevant once you are flying the ILS. Speed has all the advantages(provided you are ahead of the ac) in a 172 doing an ILS as it significantly reduces wind effect. Remember this a light ac where its ils approach speed can varied between 100kts and 75kts with few adverse effects (yes we can go both faster & slower) but if the aim is to make the approach easier then faster is my choice. However, once visual does this change? of course it does we want slower and given:
a. Despite many of the 172s good points slipperyness isn't one of them
b. From the 172 world ILS & short runway is an oxymoron
Visual should be power back configure for landing and (in all likelihood) be able to taxi off the runway before the ILS touchdown point.