In my opinion if you were to start trying it out i would have you only try it if you were sparring with newbies or lads with less talent then you..

Also im not sure that Pbf is the one you want to be watching if your looking to study the shoulder roll defence and the whole body movement sort of defence..

Firstly if would prefer to study on fighters like hopkins and toney.. Mainly since they are more prominant with the style and floyd does it from time to time..Looks lovely against ndou granted..But floyd is twice the fighter phillip was.. and he has all the skills tied in with it..

If you could possibly find fights from ezzard charles, jersey joe walcott, archie moore.. Then thats where the style really comes from and is the best way to really study it and try it yourself during light sparring and get a feel for it .. Just as bhop and toney have learnt from the old school fighters and put theyr own spin on it.. you cannot learn someone else's style to textbook but incorporate it into what works best for you..

Also just for the sake of throwing it out there.. Member just roll mainly the left shoulder as its easyer to roll and lean away from the right hand.. and keep your right glove up by your chin.. since its important to guard from the left hand..

Hope this is of some help
Peace