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Depends on the construction, most/all are glued and stitching is decorative. Main issue is that it doesn't just pop off, the rubbery soles are a mess when being removed. You gotta use the rough band and it stinks and makes a mess.
Different soles glue better than others, and all must be shaped after attaching.
Also stuff like vibram and commando are more expensive cos of the branding.
Just see what timpsons say. But yea... post some pics as you DIY them later.
Tldr: rubber sole desert boots aren't made to be repaired.
It's an epic job if they're proper soles, if you're willing to pay for it go ask in Timpsons, ask for the cost to send off to get resoled. They probably won't do it in the shop.
(Caveat emptor, whatever your opinion on Timpsons, if they hash it and you complain then you can get a new pair for free, that's the guarantee)