I ordered a roast whole pig from a local meat market. They've told me that when I pick it up, it'll be fully cooked and in a foil lined box. My concern is what do I do from there? Is there going to be a lot of butchering involved to get portions off for each guest or is it easy enough to grab a hunk of meat and slap it on your plate?
It really depends on your audience and setting.
With a Filipino Lechon, it's served communally and eaten as pulled pork, so it's expected that you'll just plunk it down on a side table, and people will crack through the crisp, almost hard, skin and pull servings for themselves with tongs or forks. And they'll go for the whole thing, skin, ears, jowls and all (most people I know don't eat the ears, but they may crunch the crispy skin off them).
A similar thing is done with a country-style hog roast. Those may be skinned before serving, but generally you're responsible for pulling or slicing what you want right off the hog (and usually throwing it on a cheapo burger bun).
In both of these settings there are almost always some people who don't want to dig right into the pig out of squeamishness or out of fear of getting some part that's not nice to eat. The good host will periodically pull some of the good stuff onto a platter for those folks.
If you're doing something more formal, I guess you'd want to section it like Foodrules suggests.
Your question is fairly difficult to answer via this forum, but I will try
I hope I have given you some ideas, but may not be very detailed descriptions.