Ha! You replied while I was editing mine... Sorry.Everything from counting: Planning | Best Practice Guidance to drone survey: Deer Drone Surveys | BH Wildlife Consultancy. The latter being the most accurate technique.
Depending on spp, a drone survey is not going to be within the reach of a single stalker/ landowner. What I was trying to get to was that none of this is easy for a single landholding - it requires co-operative action, with shared objectives.
And when the best practice days come up in anyone's locality, go to them and join in.
& I thought some of my comments could be sarkie