Hey irr4tion4l,
Fellow 29 year old wearer in Sydney here.
I usually do it all myself, but i know of a couple of people that do hair system attachment/cut-in work.

Gayle in Merrylands - 0409877456, and Mary in Campsie 0406918887

Alternatively, if you'd like to grab a coffee some time i'd be happy to share what i know. I'm by no means a pro, but been wearing for a couple of years, so i've learned a lot in that time. I'm in Marsfield.
PM me if you'd like to set something up.