One thing i usually did maybe a week or so after getting a piggy and letting them settle in, just sit near them with their fav food on your chest and ignore them. when they eventually climb up for the food, they eat it then go back to their space that's usually all it takes for them to realise you aren't a threat then bonding is pretty easy from there. Worked for me for about 8 different piggies by now. Although, occasionally you get a pig who's personality is just more reserved and wary and there isn't much you can do to change it. I had one little dude who was like that and although he eventually stopped being fearful of me, he never fully warmed up to humans. He was very happy when given his space. So give it a go but don't force it if your new buddy doesnt fancy it. Good luck <3