I think the first thing to do is to be sure that it is carpal tunnel.
Even with an Electromyogram, my own case was misdiagnosed. This led to an open carpal tunnel operation on one hand. The operation is outpatient, takes about an hour and with local anaesthesia. After that, the healing process was about three weeks, bandages and initially, a sling. Final healing took another month, as the skin was still sensitive.
Although the problem was in both hands, the operation is done on one hand at a time. As I recall, the total cost of the operation (medicare) was about (edit) 8K.
I believe that endoscopic surgery is mostly done with younger patients, and may require follow ups...but am not sure about that.
In my case, the diagnosis was incorrect, as the tingling and pain in my fingers was peripheral polyneuropathy, usually a result of diabetes, though I don't have diabetes. The initial pain was in both hands. The surgery did nothing to help the problem.
This was about two years ago. Now, while I still have the neuropathy, I have learned to live with it. the skin on the fingers is totally insensitive, so there is no feeling of heat or cold, and the normal things we do, like turning a page in a magazine, requires learning new tricks of manipulation. The pain part, became just a matter of getting used to, though I do use Neurontin (gabapentin) when it it really bothers.
Most of the people in my community who have had a carpal tunnel operation, report that it was successful, although some found little relief, as was my case.
There are some UTube exercises, that could be helpful... mostly stretching the finger tendons to relieve the pressure on the nerve.
The operation involves cutting a ligament that closes around nerves in the hand/wrist.
Here's an article that suggests alternatives.
Carpal Tunnel Syndrome Surgery, Recovery, Complications, and More
While some people swear by the operation, I would suggest it as a last resort. Also... depending on the doctor, I would want more than one opinion. The operation is relatively expensive, and based on the number of people in the clinic when I went in, (six), it looked like an assembly line. The person at the desk told me there were 15 operations that same day... same operation. Same doctor. Trust but verify.
Good luck...