Sorry for the late reply.. i've been without the internet for a bit
I'm a strapping 6"5 that enjoys working out.. so the weight isn't really an issue hehe, the size of the thing is something to get used to, I used a waist-level viewfinder for this project, I find that it helps when focusing and helps the image appear brighter on the finder.
Wack it on bulb using a cable release (I use one that holds in place when pressed in), and then time the exposure using my watch.. again judging each exposure on the intensity of the light. I used to play with 100 year old plate cameras so judging exposure times sometimes comes naturally.
The 67 is a delight to use hand-held, I feel slightly empowered when holding it
the mirror-clack is legendary, and the camera has a lovely tendancy to produce very contrasted images especially in daylight.
I was tempted to use 800 speed film at one point, my film supplier suggested it to me and quoted that it gave even more impressive colour saturations than the 400.