theres a tool ive seen advertised in national dragster thats made to help slip the braided line inside the sleeve.the secret is to get a clean cut like you allready know. i use a thin cut off wheel but the shears work ok too. i also use a lubricant for o rings called parker o ring lube that works better than anything else on the hose and barb betore tightening the fitting. only use sealer on pipe threads not on a 37 degree or 45 fitting . use oil on the threads and ferrel