When we got our first one as a one year old, she was wild as stink as previous owners couldn't do anything with her, and she would charge you every time you went near. Took three months and patience to tame her, she then became a favourite with pig course people, and would love to be stroked and fall over for a belly rub. The she had a litter, and we didn't find out how many for two months - she wouldn't let anyone within 20 yards of her or her babies. She never became tame enough after that to trust her with anyone other than us, and even we had to be careful.
Definitely not a first timers pig !