I’m long retired now, but my last 3 years of face to face ministry was co-teaching RCIA.
I have long been delighted with the enthusiasm and desire to learn the Faith of you HS guided folks.
Here’s what you need to know:
VAtican II was a “Pastoral;” Council; meaning no NEW Doctrines were taught [and therefore commanded]
What it wrought though in PRACTICES which are by Law Changeable; and which were quite often duplicitously COMMANDED in error. GOOGLE the history of ENVIRONMENT and Art in Catholic Worship… now replaced by BUILT of LIVING STONES is having it’s intended effects by those who were behind its innovations.
BUT God Is in charge, and as He promised the gates of Hell shall not prevail ;Mt 16:18-19]
GET The Catechism of TRENT; Awesome and very Traditional
Respond to them that GOD GAVE ALL the Key’s to Heavens SINGLE GATE to Peter and PROTECTS that choice.
That the FACT that the RCC is 2,000 years old despite wars, persecutions and inside the Church duplicity. is evidence of the Presence of the HS as promised
And that it is NOT what the Council ACTUALLY said, but was ignored and innovateed that is the cause for concerns, so they logically have NO grounds on which to make their claims in a supportable manner.
John.14:  But the Counselor, the Holy Spirit, whom the Father will send in my name, he will teach you all things, and bring to your remembrance all that I have said to you.
John.17:17 to 20
"Sanctify THEM in the truth; thy word is truth. As thou didst send me into the world, so I have sent them into the world. And for their sake I consecrate myself, that they also may be consecrated in truth. “I do not pray for these only, but also for those who believe in me through their word”
God simply cannot lie
Pray very much