@texasduchess
Happy Sunday!
I think you hit the nail on the head when you said "you would definitely want an experienced and knowledgeable doctor".
As far as PCP goes, I don't think they work enought with psychotropic drugs.
They may re-new prescriptions and give something mild to 'take off the edge', but I don't think they really KNOW.
There are 2 professionals who SHOULD know very well how the drugs work; it is their job to know.
A psychiatrist, who should manage the medication(s) and a pharmacist who should be able to answer questions (especially with the data they have available via internet).

For me, it was ages ago and it was my PCP who was 'taking me off Effexor because I was doing so well."
Sure I was doing well, I was on the correct medication for ME.
She did not 'wean' me off slowly at all!
I only got to the first part when I went into withdrawals!!!!!!

The therapist I was going to suggested I see a psychiatrist to manage my medication(s).
I did, and she said it would take (I think) somewhere around 6 months before I would be able to go back on.
I waited and tried a couple of other meds the psychiatrist suggested, even one that was suppose to be similar to the Effexor.
NONE of the meds worked for ME!
At the 6 month point, I asked to go back onto the Effexor since it had worked so well.
The doctor agreed.
Although the Effexor helped me, it did not make me 'feel' the way I did before.
The HORRIBLE anxiety was gone, but still, just not the same.
I really don't know if I can explain it well other than I no longer 'felt like myself."
I felt like I was outside looking in.
It did not last, but again, I still just didn't feel the same.
However, I was SO very happy that all the anxiety attacks ended and I was able to get back to my life.
That was probably over 15 years ago.

Hope this helps...
Ronnie (GRANDMAr)