Seeking DP advice

Hi all, it’s quite possible that a life long fantasy of mine will finally come to real life this weekend!! I am meeting up with two lovers for my first mmf threesome. I would love to try double penetration but I’m nervous and wondering if those with experience can advise? I imagine it’s not quite as easy as it looks in porn. I’ve had anal here and there but not a ton. Are there foods to eat/not eat beforehand, ways you like to prep? I don’t even really know the right questions to ask. Also, health concerns going from anal to pussy? TIA!