This was with the compressor running (a/c on) I'm assuming - yeah I would take it to dealer. Make sure you didn't add r134 or it's gonna be a big headache.
I saw youtube video of someone who did this. I messaged him to delete it since it's technically $1000+ EPA fine (even for individuals; at least from my reading of regulations, I may be wrong). He said it worked but it wasn't quite as cold.
I have a friend in Ukraine who says mechanics there at...
I basically just followed this tutorial:
https://www.carcarekiosk.com/video/2016_Honda_Civic_LX_2.0L_4_Cyl._Sedan/air_conditioner/recharge_freon
"Low side with AC full on and engine at normal operating temperature?" --> correct
I had to charge it once more. It's now a year still cold. Gonna order more. Assuming I'll need to charge it twice a year. May depend on how bad leak is.