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

https://www.bookmarking-presto.win/installing-a-diy-mini-split-has-never-been-easier-with-pre-charged-r-454b

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