Not diagnosed, so feel free to ignore this, but...
I've been medically recognized as having BPD with high narcissistic traits for a bit.. maybe a year at least? The specialist avoided diagnosing me because I was 17 when I saw her (also she wanted to discuss with me more how beings diagnosed would affect my life, if at all).
My BPD has fucked with me alot, but the narcissistic traits hurt me and others the most, I'd say. I've done too many things I regret, ruined too many friendships and relationships.
I haven't gotten much therapy for it, but I've found that thankfully, it's easier for me to step back and psychoanalyze myself than it typically is for others. I suspect it has something to do with the fact that, as an autistic person, I had a hyperfixation on psychology for years. That and the fact that due to my DID, each alter has differing levels of symptoms, which can aid in having "another person" to sort of.. look from an outside perspective.
My mother also has BPD with narcissistic traits, though we have very different symptoms. I have quiet type, while she has petulant.
I'm sorry that I don't have many tips (not to familiar with your particular cluster or PD) other than.. try to stay on parts of the internet that don't stigmatize PDs. I tend to see newly-diagnosed people fall into the whole "certain PDs are evil" thing. Too many BPD-havers shitting on those with ASPD or NPD, despite all three disorders sharing a cluster and having similar symptoms.
Not only does this thinking harm others, but it harms yourself. You become blind to the traits of these "hated" disorders in your own actions.
Stay safe.