I would just like to know who you would recommend in the Melbourne area to fit a 10psi pulley to a VT commodore as I am not confident in fitting it myself ?

Any reputable/trusted mechanic would be able to install this upgrade for you without any problems. Otherwise, depending on the suburb you're located in, we could recommend someone closest to you. In saying the above though, depending on your mechanical skills, you may still be able to install the boost upgrade kit yourself. To get an idea if this is the case or not, please refer to the fitting instructions in the link below:

http://www.maceengineering.com.au/WebRoot/ecshared01/Shops/mace/4E1D/A79D/D800/6FA9/364C/C0A8/D240/1463/PULLEY_INSTALL_instructions_pdf.pdf