Very hard indeed; incredibly hard, almost, if the result of that labor was to be the smooth and rounded and flexible and letter-perfect English of the _Venus and Adonis_ in the space of ten years; and at the same time learn great and fine and unsurpassable literary form.
However, it is "conjectured" that he accomplished all this and more, much more: learned law and its intricacies; and the complex procedure of the law courts; and all about soldiering, and sailoring, and the manners and customs and ways of royal courts and aristocratic society; and likewise accumulated in his one head every kind of knowledge the learned then possessed, and every kind of humble knowledge possessed by the lowly and the ignorant; and added thereto a wider and more intimate knowledge of the world's great literatures, ancient and modern, than was possessed by any other man of his time--for he was going to make brilliant and easy and admiration-compelling use of these splendid treasures the moment he got to London.

And according to the surmisers, that is what he did.
Yes, although there was no one in Stratford able to teach him these things, and no library in the little village to dig them out of.

His father could not read, and even the surmisers surmise that he did not keep a library.
It is surmised by the biographers that the young Shakespeare got his vast knowledge of the law and his familiar and accurate acquaintance with the manners and customs and shop-talk of lawyers through being for a time the _clerk of a Stratford court_; just as a bright lad like me, reared in a village on the banks of the Mississippi, might become perfect in knowledge of the Behring Strait whale-fishery and the shop-talk of the veteran exercisers of that adventure-bristling trade through catching catfish with a "trot-line" Sundays.

But the surmise is damaged by the fact that there is no evidence--and not even tradition--that the young Shakespeare was ever clerk of a law court.
It is further surmised that the young Shakespeare accumulated his law-treasures in the first years of his sojourn in London, through "amusing himself" by learning book-law in his garret and by picking up lawyer-talk and the rest of it through loitering about the law-courts and listening.

But it is only surmise; there is no _evidence_ that he ever did either of those things.