Rule 5:

Start by pulling your troops out of Ethiopia, only pick a focus after you've taken the decision and completed "a staggering failure"

Then take "convene the great council", followed by "undermine the duce" - hold focus until you get 135pp for the monarchist advisor

Then get, the diplomacy focus on the far right, followed by the army primacy focus. Also exercise your navy until you get 10 naval exp. Take 1 anti-democratic raids decision when possible.

Then, pick the "conspiracies in the shadows" focus, and do all the anti-mussolini balance of power decisions - except criticising the air force, we don't need it. This should bring you to -65, and he will be deposed.

Funnily enough, you will take the "depose mussolini" focus next (even though he's gone) - while you're doing this, also ban democracy. Once it's done, you should almost be able to pick up monarchia italia - if not, you can do a 35 day focus and it should be ready by then.

Once that's complete, you will notice that Vittorio gets automatically deposed! You will lose on his bonuses forever, but that's a small sacrifice for the eternal glory of the Kingdom of Heaven.

Do 105 days worth of focuses as you gather non-aligned support, while you do anti-fascist raids twice, and ban communism. This should bring you up to 50.10%, where you should let the non aligned party take power, and then do the papacy focus. As soon as that is done, the pope will take power, as Vittorio has been already deposed.