Hi Degsy,
I was advised not to try to ream the small ends myself without sufficient experience, as it is thought hard to achieve absolutely perpendicular alignment to the rods, or in other words parallel to the crankshaft. From the efforts of a previous "mechanic", I had one piston tilted to the right by 10 thou and a subsequent smoky exhaust - the small end was not parallel. Took me two attempts to remove the top end and replace the rings, re-hone etc without success before I discovered the piston tilt. Opinions vary but generally the tilt should be less than 2 thou over the piston width, which means about 0.5 thou tilt over the width of the small end bush. Now that is a tall order from hand reaming!
I asked the machinist if he could replace the bushes without removing the rods. He said "I want the rods". Although I do have the reamer, I decided to give him the rods, so had to dismantle a newly rebuilt motor to give him the rods.
He machined the small ends perfectly perpendicular, and I think it was well worth it.
No matter how you decide - as a final check, I was advised to get hold of a 0.750" Bright alignment rod and pass it through both small ends. If you are a good machinist, make your own alignment bar.
I purchased a 300mm length of 19mm bar ( 0.748" ) and a 19.05mm bar (0.750" ). That larger (oiled) bar squeezed through nicely with very little force. I took a photo for reference (Sorry about the background clutter).
Col