Get a good bag of Nugs, a 1/2 gallon of OJ, and some good music on hand before you start. Stay away from anything that could possibly scare the shit outta you while your tripping, or it will lead to a bad trip, trust me. It's best to stay inside the house in a locked room as well, unless you are in complete control of your trip and can handle the outside influences on your mind.
It's also a good idea to roll up all the joints, and pack all the bowls you are gonna smoke while tripping, before you start tripping. I have literally tried to roll a joint for around 4 hours while tripping balls, and still never succeeded even once. We usually just ended up staring at the tray and the pretty colors and shapes swirling around on it.
Last and most importantly of all, once you start tripping hard, NEVER try and stop tripping. You will freak the fuck out when you realize that you can't stop, trust me. Just remember to go with the ride until it is over, and you'll be fine. I've been on trips before that where so hard, at the time I thought I would never come back, and it really would scare the shit outta me. I always did though, it would just take around 12 hours.
Good Luck to you and happy tripping.