Can you install it on a stock PS3 out of the box then?
Some sort of bootable fuss free DVD ISO would be nicer though for distribution to the average console gamer out there .
You need a custom firmware that has the install pkg option.Custom firmwares can be found online,do not install 3.56 as sony did some nasty things and you cant go back to 3.55 easily.Now if you are too afraid you can just install the custom firmware install the applications and then go back to your official 3.55,now the applications wont be lost,and can be runned as they are signed.
I think the best install option would be to have the custom lv2 access application,along with the latest backup manager.
That way you can install official firmware after and still have the ability to play backups.