"Romilius.... Remove the lower
"Romilius.... Remove the lower unit retaining bolts, then attempt to remove the powerhead, moving it up and down. If the lower unit moves up and down also, the driveshaft splines are frozen within the crankshaft splines. If which case, that's a mess! Sometimes one can free the splines by yanking the powerhead upwards, then having the skeg of the lower unit supported so that it can't drop, force the powerhead back down, gradually freeing the splines. Sometimes, the driveshaft has to be cut. Spraying penatrating oil at the splines might help. Sorry to say there's really no set cure.
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