I was diagnosed officially more than a decade ago, but it had been "suggested" to me several years before that, after an OD and inpatient treatment. As I wasn't 18 at the time, they didn't want to tell me anything definitive. I, like so many other people here, always knew something was "wrong", though. Now, at 32, I've been diagnosed repeatedly, but it wasn't until the last year that I started actively receiving help in the form of a DBT counsellor. While I didn't have trouble outwardly accepting my diagnosis, I fought it internally (using a lot of fast fixes that didn't work) for a long time. I honestly thought I could handle it myself if I could just find the right thing, place, person, whatever, that would fix me (for the record, I was pretty monumentally wrong on that).

For jackieboy and any others who might be wondering if you're doing the right thing by asking counsellors/psychiatrists if they've got any experience with BPD: absolutely! You should definitely know going in if the person you're about to see has any experience with your particular problem, especially because BPD has such a stigma attached to it. It's your right as both a person and a patient to know their credentials.
If they either slack off or spend their (your) time trying to "prove you wrong", you deserve a better therapist!