if you've shot you know the basics about rifle handling, that's a good start. safety is everything of course. high seats vs on the ground stalking just depends on the lie of the land and what the stalker deems is the best start for you to be honest. stalking on foot, tip-toeing through the leaves and twigs, spotting that deer 75 yds away, getting in position, taking the shot, this (imho) is the 'real' thing and is what really gets the adrenaline pumping when the pressure is on - it's what made me fall in love with stalking...it's you against the deer, the odds are in their favour - highseats it's all in your favour, and even though that may sound good, it's not quite the same.
camo clothing is fine, a hat of some sort, and some wellies, maybe fingerless gloves too. ensure your wellies don't make noise when you walk, if so, put on some extra socks to stop it. avoid clothing that makes noise..bring a cough drop or two as well, just in case. also, if you need to sneeze, hide your face in your elbow pit....if you have a running nose, wipe it anywhere, don't blow it! LOL.
you sound well prepared, or, spend some time on utube watching some stalking like fieldsportsbritain,,
oh, and don't start talking about shooting at long range, stalkers generally despise the practise (100yds or so is the name of the game if you 'can')..caveats apply...