Ah you have travelled through, but not hunted?
Strategy, first off get off your fat back side (sorry a generalisation not aimed at you

) and do months of fitness preparation so you can deal with distance and altitude, 7000' is a breeze, above that it gets a little difficult (I hunted up to 10,000' in Montana) and some people can't deal with it.
Tactics, no different really, be careful of the wind direction, which can change in an instant, beware of morning and evening thermals, glass and more glassing, find elk, if you can't find Elk stalk into the bedding area's generally on the north face of the mountain.
Use other hunters if they are around to scare Elk in your direction.
My bulls, one shot coming out of the timber, the other one across a valley in it's bed.
Don't forget a bear might beat you to the kill!
I hope that helps.
One final thing, I didn't use a guide, the only help I had was my mate to help with extraction.
I agree, I have taken 4 guys with me on my hunts to Montana, the first friend struggled, in fact he couldn't cope, and in the end I just went out on my own, he gave up Elk hunting, the other 3, put in the effort and did well, one helped me extract my Elk, 14 miles that day at altitude with heavy packs.
I first went when I was 52, last time 58, I'm 60 now but already thinking about going back in 2021.
Cheers
Richard