Don't worry about being EXCATLY right on spoke lengths there is normally a 1/2mm tolerance either way as Dogs mentioned at the recent wheel-build classes. My spoke length was 281, but I easily acheived a decent(?) first build with 282mm.
Just get stuck in and don't fret too much, its a lot easier than it first seems.
*whilst I may have not answered any of your questions, I hope that helps...
Don't worry about being EXCATLY right on spoke lengths there is normally a 1/2mm tolerance either way as Dogs mentioned at the recent wheel-build classes. My spoke length was 281, but I easily acheived a decent(?) first build with 282mm.
Just get stuck in and don't fret too much, its a lot easier than it first seems.
*whilst I may have not answered any of your questions, I hope that helps...