Close enough perspex.
You do not need to run the patcher once the BDEMU is done.
Once you have kmeaw installed then you will see the option to install package files on the xmb (in the game menu drop down).
On the pc, put multiman package and BDEMU package on the root of the usb drive (no folders, just in the root).
Plug that into the PS3, select the "install package file" option, run the multiman package, then run the BDEMU package.
That should get you going.
I posted a link to a really good tutorial a while back (a bit newer than the one perspex posted (his is still a good link to follow though)). I will see if I can dig up the link for you.
Instead of just a link to the tut, I decided to just give a link to the entire thread about it.
Several links are posted and a good bit of other info on the subject.
I like the last link I posted the best. You would just install the Multiman manager instead of Rogero.
Hope this stuff helps.
I would much rather go to my grave not needing my gun, than go there wishing I had it.