Hello @Alice1993,
A very warm welcome to the forums from myself, I hope you find some support for yourself 🙂
Please let me know if you have any problems getting around the forums, I'm happy to talk you through it!
You mentioned you are wanting some more information on BPD, you might want to firstly read through our BPD Factsheet as well as read some online resources on the BPD Foundation Australia website, I'll put in the links below:
SANE BPD Factsheet
BPD Foundation Australia
Like you said, it takes a lot of knowledge and experience to know how to diagnose someone with a specific mental illness and particularly BPD, so please try not to self diagnose as the symptoms for BPD are quite similar to many aspects of people's personality in certain stages of life. It's important to receive that diagnosis from a Psychologist who has experience with BPD, you can find the appropriate psychologist using the APS website 'Find a psychologist' service:
Australian Psychological Society
Find a Psychologist Service
Hopefully these help you as a start, I look forward to getting to know you better 🙂
Lunar