I had the delight yesterday to be asked to do the maintenance test flight on a Tiger Moth. It had not flown in 7 years. I was surprised to find that it did have an airspeed indicator in the panel (I still liked the one on the wing strut though - easier to read!). I had to check myself out, as there was no one else available to fly it.
Wanting to be very gentle on the 70 year old engine, but still being weary of it quitting (with no undershoot area), I did high, power on, full sideslipped approaches, so if it quit, I could still make the runway. The airspeed difference between cruise, approach and flare does not seem to be that great in the Moth anyway, so planning descent speeds seemed un-necessary. I just flew it by feel, and it worked out fine.
Trim? Haha!