Yo, me personally, i recommend you stay in puppet's camera 90% of the time, and in the little free time you have after winding his box, take out as most bunnies as you can from toy freddy's cameras, as you will need to quickly cycle through them. As for the difficulty spike, its not that much more difficult, i beat it second try (first try i didnt know what the bunnies did). And ofc, it gets harder with the hours, so nearing the end of the night, u may feel like ur gonna die, but u just gotta keep going for a bit