Hello, I am also new to pig keeping! I have a 1 3/4 acre field split into 2 unequal halves. In the past we have used electric fencing split the field into further sections. The smaller section has our 3 hen houses - the pigs are not allowed in this section as we don't want them breaking into the hen houses and stealing the food, knocking over water e.t.c.
The pigs have the larger section, which we decided not to split up and see what damage the pigs would do. They do roam all over the field and certain areas have been 'ploughed', but so far it hasn't been too bad. We plan to slaughter them in October and rest the field until Spring.
I guess for you it depends on what your land is like - drainage, soil type e.t.c. We are taking the gamble to not strip grazing, but I may come to regret the plan if we have a wet summer. If that the case the electric fencing will have to go up. Suck it and see is my long winded suggestion!