A couple of things to remember with mushies:
If you eat, the high goes away. Any radical change in your blood sugar with kill the silly in your blood. I usually eat myself retarded a couple hours before so i won't get hungry. I trip for HOURS. Also, if you take em with chocolate, to cover the shit taste, it helps. There's something in chocolate that acts as an uptake catalyst. I trip a little better when I eat em with chocolate.
The same works w/ LSD. If you start having a bad trip drink some milk, eat cheese, have a bowl of cereal, dairy seems to be Acid's kryptonite.
Your state of mind and environment are all factors as well. If I'm not somewhere comfortable the trip usually isn't as good. At home or at my neighbors I do fuckin awesome. \
And mushrooms are best taken in the day time in nature, a park, beach, forrest, whatever. Something about the mushrooms makes plants, animals, trees, birds, sooooo much more trippy.