Nice man.
It really depends on the person. I try not to smoke during a trip, just because I like to experience solely the mushies. I have smoked towards the height of a trip, and it was insane. I didn't start freaking out or anything, but it definitely altered the trip. I tend to smoke towards the end, when everything is winding down. It usually intensifies the mushies for a wee bit, and when they wear off, you're stoned. So I dunno, personal preference I guess. You won't need to smoke much, because the weed and the shrooms make a strong combination. Good luck mangg, hope you have an enlightening trip.