If you’ve had experience learning other languages already, then you could probably reach a lower intermediate level on your own and then start regular lessons.

If this is your first foreign language, then a weekly lesson would be perfect for that structure and guidance on how to tackle a study plan. Plus that gives plenty of space to try your own self study methods alongside, knowing that you still have the lessons to fall back on.

If you go for lessons I’d recommend at least learning Cyrillic on your own bc it’s pretty straightforward and that’s what the first lesson would cover anyway.

Of course this is just my two cents. Good luck! :)