Before you waste loads of time doing the different ways of refining your fibres, tie some of the fibres into an overhand knot and pull tight. If it cuts itself in half then the fibres are useless for tying knots. I found this with some fibres I got from some leaves The Ratbag gave me. I spent weeks retting and combing and got some really long, gorgeous looking fibres. I twisted one up into cordage, just a simple 2 ply thread and it was really strong. I tied it around something and it snapped so easily. It did the same with the cordage braided and laid up in 4 ply, etc cordages! All that time wasted!