Send them off to someone that can do it. Even on simple LC cranks you are better off getting someone who has build 100's of the buggers to do it, as the only way you'll find out that you've messed up, is when you've rebuilt the engine, fitted it etc and started it up. I've seen poorly rebuilt cranks last 40 or 50 miles, so adding to the extra gaskets and rebuild, you now have to get the bike home!
I did look at buying a press, V blocks, decent DTI etc etc for doing singles but in the end, its a lot of hassle for not a lot of gain (in saving).
It's also why I don't spray, or weld aluminium. Got people who can do that bloody well
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More **** two strokes than you can shake a **** stick at.