Hi Donald ...I would get the permission.
Apply for FAC ...remembering ,firearm optics,security, knives etc £££
Find a mentor,
Do a course e.g DSC1 this wont make you a stalker but it will give you a start....more £££
Study your ground to know what you have on there, what you can take off that will benefit the deer , the farmer, and you .
Know what to do with what you take, Happy eating ,good luck