Welcome to the forum, yes we are here to assist and some times laugh.
Some times members try to protect other members especially if they seem not to
have enough knowledge.
I believe that depends on the individual some can, others can't.
In your case you were able to do the repair, and I am glad that you did.
You are from the ones that can so keep on asking.
(You are not from the types that give up easily.)
Right Mr, L Bull?
One of the problems that I see on charging is that the refrigerant has oil with it.
It is OK if you have a leak and you only add a can or two.
(Some of the oil leaked out any ways.)
But too much oil takes the space of the refrigerant so the system gets over loaded
with oil, and there isn't enough refrigerant to do the cooling....
Two test gauges with valves will do a better job like Bob recommended.
But you can also get easier in trouble.
As far as the car been expensive or dangerous.....
It is the same danger on an inexpensive car.
Now as you know there is a lot of legality's of blowing refrigerant in the atmosphere.
So replacing compressors evaporators etc, with out certification, the proper tools, and know how I would say leave that out for now.