It's not impossible but the needed in order to actually impliment the hacks can be time consuming as running hacks on the current firmware can require the user to need two PS3 consoles, one with OFW and one with CFW, the next step is to use the file transfer system which is built into the ps3 to transfer the files from the CFW to the OFW PS3 which is running 4.11 or whatever is know.
If I could provide a detailed guide I would but I can't at this stage, I can only provide my knowledge on the area of PS3 Jailbreaking.