If you're tackling a DIY mini split install, look for models with pre-charged...

https://papa-wiki.win/index.php/Should_I_Buy_the_9k_or_12k_Mini_Split_for_a_500_sq_ft_Room%3F

If you're tackling a DIY mini split install, look for models with pre-charged quick-connect linesets that save you from handling refrigerant or using a vacuum pump