No.
I do this (and many other things) for a living, LISTEN TO ME. You fuck shit up and grenade the compressor because liquid R134a and oil pool inside of it due to overcharging and you can kiss EVER having AC in your car again. It WILL shoot metal debris into every part of the system contaminating it. You'll go from maybe needing a $200 compressor to needing a condenser, receiver/dryer, and evaporator. I don't think you want to tear the dash out of your car over a $150 AC system evac/recharge. Once metal particles are in the system you can never flush all of them out. Some will remain and they will continue to eat and destroy new compressor after new compressor constantly recontaminating the system with metal.
When they're recharging the system, if they know their shit, they'll be able to see if the system has a bad compressor or blockage on the pressure gauges. Right now, you could have 1/2lb or you could have 3lbs. You could have 4oz of oil or you could have 6oz of oil. You could have just gummed it all up with stop leak goop and it'll never work right again.