Experience/ boots in the dirt counts for far more than any kit. It is very hard to resist the kit monster - but look at the bun fights that prevail on here regards 'my kit versus your kit' etc etc. There are a few hard and fast truths, but for the most part kit is a very personal and subjective thing.
You dont want to ruin or make unnecessarily unpleasant a paid outing, but it is by being out that you build the best idea of what works for you. It doesnt have to be on a paid stalk and afternoon forest walk is never wasted time.
Work on personal skills - skill tends to ace gear. If you build from the ground up, then good kit will suggest itself and you will get the most from it.
Never, ever believe anyone who states there is only one way/ gadget to do/for something. They are invariably wrong - and in direct proportion to how loudly they shout their stance - and often rubbish other views!
Good glass is never a wasted investment. Price or brands aside, if you want to use your glass constantly and a year on from getting it still find yourself marvelling at the image you 'done good'. That can be a balancing act between price, size, weight and quality. I've not looked through every optic out there, but quite a few. Sub £400 new only Vortex and Minox have come close for me - others may have different views.
Most Countrymen make use of a stick - there's a reason for that. Do not spend more than £5 on any stick until you try various styles and see what works for you. Start with a length or two of hazel, some bamboo, broom handle etc. As with optics, a great stick will get constant use and be a joy to have with you. Uses will suggest themselves time and time again. Again a personal view, but I have not yet found any stick system incorporating numerous adjustable joints, triggers, swivels etc that provide a joy factor. Simple still seems better.
Get your feet comfy and keep your core/ body at a comfy temperature - and everything else is secondary. Socks are really boring, but I see more clients suffer from poor socks than all other items of gear combined. Followed closely by being too hot/ cold up top. Very much a personal thing, but good wool 'mysteriously' seems to keep figuring in my top choices. Become a friend of your local BHF/ SHELTER etc etc charity shop.
Living up to my reputation - I have to mention First Aid & Rescue kit. Nothing that comes as a kit from Asda/ Tesco et al for £3.99 will prove of much use - and neither will a £299.99 'Special Ninja Forces as used in Iraq Mega Doom Z2000 Super Trauma Kit'. £10-£15 astutely spent after a relaxed evening on Google will see you right.
Finally ALWAYS be wary of people pretending to help when really they are just jealous of your long hair and archery skills...