Sentence:  Those who possess skill in handicrafts must be prepared to turn that skill into numerous channels; and in most instances men of that stamp would <WSD>do well</WSD> to make up their minds before starting, that, in case of need, each must turn mason, joiner, blacksmith, or painter, as circumstances require; of course it is not expected that he should be an adept in all those branches, but a handy fellow who can turn himself into a decent make-shift in such matters, will prove infinitely more useful and more welcome than one who is tied to the routine of mechanical departments. 
Meaning of the word marked with <WSD> tags:  To take the prudent approach; to be advised.