We are really taking a stab at this, as none of us have ever done it. We have about 3 or 4 people in the car, and got the maps and compasses out. It really sounds like a fun thing to do.
The more, the merrier, especially of none of them know what they are doing.
I find it much easier to read the meter on a mobile FM rig, but an HT can be used if that
is all you have. I put a coax switch between the front seats to make it easier to attach
the DF antenna while still having the regular antenna available (but take it off if it is too
close to your beam, as it will affect the pattern.)
As you well may have discovered, the two most challenging aspects of transmitter hunting
on VHF are the need for a good attenuator when you get close, and learning how to deal
with reflections. The "offset" or "active" type is preferred, which requires switching between
two frequencies. I typically put one in memory and one in the VFO to make it easy to
switch between them, though adjacent memory channels also works.