curious about valve lash setting/check

oldkimmer said
Pass side should be right then. Drivers side take the assambly off , take bolts out of the shaft. Slide the rockers off the shaft. Turn shaft around and slide the rockers back on. Put bolts I. And re install. Kim

I'll do that Kim, but what's the chance that I have problems because it was wrong for "I don't know how many miles"?