I searched the forums and couldn't find any information on this, so any advice is appreciated. TIA.

I am getting ready to do my first TR and want to have barb PL. The alt in question is a fighter. I was lucky and picked up a +5 greater tome in a lottery and want to use it to get some of the barb levels needed for the PL.

How many levels of barb do I need, and do I have to take them in any specific order, i.e., do I need to hit 20 as a barb, do I need 11 levels, etc.