It will be an alien experience.
Its different for sure, but has been well flushed out in "table Top" sessions in Roll20 and Fantasy grounds for years now.
If you want a near perfect recreation, then play through Solasta to get an understanding of the mechanics. They have a lesser license than Larian so they often have to make nearly identical "Homebrew names", but its amazingly faithful.
Larian is faithful to the lore, but to date, has radically changed the mechanics by making all ranged combat a fixed range (magic, arrows, and spears...Oh my).
There are other changes too, but it does help to know the classes (as intended) and adjust your play-style.
Rule #1: just have fun. Bg3 has amazing depth in its story boarding and world design.
