I'v tried V blocks etc, but I found 'em worst than useless needing constant stopping and adjustment (unless you find perfectly cylindrical logs).
IMO a sharp blade and a steady hand is what's needed, mind some woods are much tougher than others.
Someone good who knows what they are doing on the other end is a great help too.
Safety is vital but some times I'll inch it through with my left hand round behind the blade (fist firmly against the table as a guide) as a guide... Sounds horribly dangerous, but if you try it with the bandsaw NOT running you might see how I mean.
My right hand feeding the log in is usually placed so it will hit the table and can't get any closer to the blade that that.
Bear in mind I'm usually sawing soft stuff like Yew or Hazel.
Please don't do anything I suggest unless YOU are happy it's ok.
Del
Every man is his own safety officer.