most ratchets can be lube pretty well without taking them apart. just pull the cover, spray out with brakleen, let dry, and a few drop of RLL or oil and put the cover back on. no need to pull everything out unless its an old ratchet that is fully gunked up and not working properly.
round heads are different, but usually can be pulled from the body without disassembling the mechanism and risking losing parts and bearings. same procedure, pull out, brakleen, dry, lube, put back together.
if still nervous to try it, dunk the heads in oil or atf for ten minutes. its better than them being dry inside.