Because of this, a mini split is becoming a very common DIY project, the tool kit goes for $250 on Amazon, from what I understand you'll get a better install doing it yourself because you can purge the lines for the recommend 24 hours.
Particularly if you're going to flood with nitrogen (as the pros commonly do) and do a positive pressure decay test, there's absolutely no need to take overnight IMO. Taking overnight is a compensation mechanism that DIYers use to avoid buying the N2 bottle/regulator (which the pros already have because of their need to braze every so often).
I think DIYers can get as good a result as the pros, but I don't think the 24 hour vac test makes for a better result than a methodical pro will get.