Our class got a demo from our photography professor the other day about how to use a 4x5 camera. I wanted to shoot with it so badly but didn't have any film. Then later on I realized I could just use some paper I had. I cut the paper down to 4x5, put it in the holder and went out to take a couple shots. I've used paper negatives with pinhole photography before but never in an actual camera. I got back to the darkroom, threw my photos in the developer and had to pull them out really fast because either I overexposed a lot, or there were light leaks. So...just wondering, any tips for a 4x5 beginner, common mistakes, things to be sure of,...etc? Any help greatly appreciated!