I put my name plate on my saddle :)
I took a thumb tack and poked holes in the center of the dots on the nameplate where the screw would go in. This is after I had centered it on the saddle.
Then I took a screw driver and started the screw without the nameplate on. After I got it started, I would take it out, and put the nameplate on and then screw it in. I left it loose so I would be able to do the same with the other side.
I have not taken the nameplate off my saddle, so I cannot comment on the size of the whole or anything.
I'm sure if you have an awle(sp?) that it would be a lot better than a thumb tack.. but that was all I had to work with.
Hope I helped.