Good pronunciation is one of those things you would think is a basic, but is actually an advanced topic when learning a language. Just because it's the first thing in the textbook, doesn't mean it's easy. Realistically, you'll master every other aspect of your language before you master pronunciation.
In the Latin-speaking world, some people are advanced enough to dwell on perfecting pronunciation. That is good. That interest has trickled down to beginners, though, and it's a stumbling block. It's too easy to get sucked into the rabbit hole of pronunciation, and forget to actually learn the language.
You don't need perfect pronunciation today. You're never going to sound like a real Roman, and you don't have to.
Get the vowel lengths down. That's non-negotiable. The rest you have your whole life to hone. Focus your study time on the Latin itself, not the pronunciation.
In twenty years, you'll be working on your pronunciation either way. In the meantime, you might as well learn the language, too.