Curious what others have done...

Just finished physical install of an Original Air Group underhood kit on my Challenger. Same company and similar underhood components as Classic Auto Air (sanden type compressor), but uses factory parts under the dash.

I'm weighing a couple hundred in tools to check and charge it myself (vacuum pump and gauges) versus a couple hundred to take it to shop to have them leak check it and charge with refrigerant. For my part so far I'm most concerned I may have over or under tightened at O-rings or not crimped the hose connections well enough, as this is my first time dealing with A/C parts.

What have you all done? How hard are these kinds of systems to charge correctly?

Also, I don't much trust the A/C shops in my town so there is that I have to consider.