A very elderly Priest who ordinarily says the 1970 Mass said that the old Mass is in our Catholic “genes”, as if to say that a Catholic will instinctively recognise it as their own, regardless of whether they spoke Latin or not. He said it is a good and holy thing to have a devotion to the old Mass.
It is not necessary to understand all of what is being spoken at Mass for it to be efficacious in giving grace to your soul. In fact, mass is so mysterious, that the vernacular can lead to a distorted understanding (not that it always does) that because it is in our own language, we can understand what is going on, and tends to eliminate the utterly unfathomable mystery of what happens on the altar. That can lead to a decline in belief in the things that can only be known by revelation rather than our cognitive powers, such as the Real Prescence or the Holy Sacrifice. All the Eastern orthodox churches use non vernacular languages, as did the catholic Church until the late 60’s. The Jews have their ceremonies in Hebrew which is not vernacular. It preserves tradition, and helps us understand that what we are participating in is timeless and eternal, not only contemporary and “now”.
There are plenty of online resources to help you with the translation of what is being said, plus 1962 Missals for sale from St Joseph Press and Baronius Press. And usually an indult Mass will have a Missalette at the door for you to use, with Latin on one side and the vernacular on the other. After a few Masses, It is not hard for most people to have a fair idea of where they are up to, if they pay attention. The Exraordinary form of the Roman Rite is the oldest of all the rites in Christendom, and it has served hundreds of generations well enough to see tha Faith handed on over the millenia.
There is nothing at all to fear from it, but everything to gain. You would be most welcomed by the usuals. I highly recommend attending if circumstances allow.