Yup! That the long and the short of it.
You’ll have trim at least enough hose to remove the old barb. Then place on the nut, then the olive, then set the barb. Seat the hose into the shifter, then slide the olive up to shifter, then hand-start the nut, before tightening it down.
Follow any of the brake bleed tutorial - I quite liked GC Performance’s on YouTube - and rewrap the bars.
