It sounds like you are too clumbsy for large format work... you better just stick to 35mm. Seriously though, it takes awhile to get used to it. The plastic clothspin thing works great. I actually usually only process two sheets at a time due to my baby budget, and the risk of F'ing everything up. Dust is a major problem in my darkroom, but for some reason, no problem on my negs. I either use a closet or a changing bag and never have specs (now I just totally jinxed myself). Keep you chin up, it will get easier.

Brian