I used (1) 36oz canned pumpkin and about 4-5lbs of roasted pumpkin. I gutted the pumpkin, cut it to small cubes, skin side down, and baked for 60 minutes at 350 F. Then I scrapped off the skin and mushed it into a squash like consistency. I then put this mixture into a large muslin bag and dropped it in while steeping my grains. I heard stories of people losing upwards of 1.5 gallons of beer when they left the pumpkin rind in the primary. And lets be honest, a pumpkin is a gourd. It isnt supposed to taste/smell like the candles you buy at yankee candle. That is where the spices come in! I added nutmeg/ginger/cinnamon tea type tea 5 minutes before flame out and another bit of cinnamon per taste before i put it in the secondary. Turned out great.
I would suggest putting it in a muslin bag as the flavor of a pumpkin is really a squash/gourd flavor and i didnt want it sitting in my primary or losing 1.5 gallons in trub.