actually, my strategy was this:
1 auto + 1 manual at any one time.
So in the morning, i used 1 auto (ga645) + 1 manual ( m2 + canon 1.4f)
In the evening, i used 1 auto (contax g1 with 28mm) + 1 manual (yashicamat 124g)
"Lesson No.1:Get auto focus. If no auto focus, learn to use Hyperfocal distance shooting ie. long DOF + high ISO, so that everything is focused without focusing"
Lesson No.2: Bring more than one camera. Because of film, there will be moments film will run out but the shooting can't stop. Hence the second camera is very important.
Lesson no.3 , standardise on the film. This is what some of the members advised me to do. So for all 135 format, it was 1600 (all arista premium/tri-x), for 120 format it was 800 for day (ultrafine plus 400) and 1600 (delta 3200) for nite.