I have shot a lot of hand 5x4 images hand held. Initially I thought it might be difficult, with a bit of a learning curve, my first images were shot on Tmax 100 @50 EI, roughlt 1/25 or 1/50 at f11. I was using a pre-WWII 135mm Tessar. Images were OK but slightly soft at the edges/corners.
So I had a re-think. I was living abroad at the time, my Tmax 100 ran out, all I could get was Fomapan 100 or 200, or Ilford films to order. I decided to switch to Ilford Delta 100, and ad faster films, Delta 400 for 120 & HP5 for LF. Fomapan 200 as a backup.
It's as
@Joanna Carter illustrates, it's logical to use a faster film, I also realised that the 135mm Tessar was sfter at wider apertures than an equivalent Plasmat (Symmar/Sironar) etc, or a 150mm Teassr/type lens. I switched to a T coated post WWII 150mm Tessar, later a 135mm Symmar S.
To star with I was using a Crown Graphic, focusing was improved by adding a fresnel screen, which made it very quick and easy. The downside was the Crown Graphic had very limited movements. I found a Super Graphic, listed on 3 forums, it has issues, was cheap, but usable. Once I got the parts, I fixed the issues.
My main reason for working hand held was shooting where tripods aren't permitted, I would use a tripod if I could. It was important that the hand held images were indistinguishable from those made with a tripod.
The key was HP5, usually shot at box speed, I could frequently shoot 1/250 @ f22. But even today, which is overcast here in the UK, I'd be able to shoot at 1/60 at f11.
I found I could work very quick hand held, compose & focus on the GG screen, close then cock the shutter, set aperture, slide in the DDS, remove the dark-slide, re-frame using the wire frame sight, and shoot, just a few seconds.
Sometimes I needed to use movements, usually front tilt, and also a wide angle lens, the wire frame finder still works well as it moves with the front standard.
Ian